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Scientia agropecuaria: revista científica de la Universidad Nacional de Trujillo.
Revista científica de la Universidad Nacional de Trujillo
Universidad Nacional de Trujillo. Facultad de Ciencias Agropecuarias, issui...
Periodical Periodical | 01/01/2010 Please log in to see more details
Scientia agropecuaria: revista científica de la Universidad Nacional de Trujillo.
Revista científica de la Universidad Nacional de Trujillo
01/01/2010

Subject terms:

Peru. - Agricultural industries -- Periodicals. - Agricultural industries -- Peru -- Periodicals. - Agronomy -- Periodicals. - Agronomy -- Peru -- Periodicals. - Food industry and trade -- Periodicals. - Food industry and trade -- Peru -- Periodicals. - Animal culture -- Periodicals. - Animal culture -- Peru -- Periodicals. - Agricultural industries. - Agronomy. - Animal culture. - Food industry and trade. - Electronic journals - Periodicals.

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Scientia Agropecuaria
Academic Journal Academic Journal | 20/05/2015 Please log in to see more details
Scientia Agropecuaria
20/05/2015

Subject terms:

agriculture - animal husbandry - agribusiness - Agriculture - Agriculture (General) - S1-972

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Efficiency of three buffers for extracting β-glucosidase enzyme in different soil orders: Evaluating the role of soil organic matter
Gutiérrez, Viviana;Ortega-Blu, Rodrigo;Molina-Roco, Mauricio;M. Martínez, M...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):419-429 Please log in to see more details
The objective of this research was to evaluate extraction methods for β-glucosidases c... more
Efficiency of three buffers for extracting β-glucosidase enzyme in different soil orders: Evaluating the role of soil organic matter
Scientia Agropecuaria. October 2017 8(4):419-429
The objective of this research was to evaluate extraction methods for β-glucosidases comparing three buffer solutions (MUB, acetate, and maleate) at different incubation times (0.5 h to 10 h) and in three different soil orders (Mollisols, Andisols and Ultisols). Seven acidic soils were evaluated, showing differences in pH, OM, and clay contents. To evaluate the effect of OM as enzymes source, one soil of each order was treated to partially remove its OM and then the enzyme assay was performed. When using MUB and maleate buffers the highest (32 and 31 µg-pNP g-soil-1h-1 in average, respectively) were found, and the latter was significantly (p < 0.050) correlated with the soil clay content. The activity obtained with acetate buffer was much lower (38.2 µg-pNP g-soil-1h-1 in average). The use of MUB buffer with 1 h of incubation is suggested as extraction method, showing good reproducibility and allowing to express higher enzyme potential for soil comparisons. For the Andisol and Ultisol, the enzyme activity significantly decreased with the OM removal (%) indicating that OM is the major source of the measured β-glucosidase activity, while a different trend was observed for the Mollisol, in which the mineral fraction (mainly 2:1 type clay) appears to be involved in the increased enzyme activity displayed after the initial OM removal

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - soil hydrolases - buffer solutions - soil organic matter - soil quality - volcanic soils

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Impacto del abonamiento integral en el rendimiento y calidad de fresa (Fragaria x ananassa Duch.) cv. Selva bajo sistema de riego por goteo y cobertura plástica / Impact of the integral fertilizer on strawberry yield and quality (Fragaria x ananassa Duch.)...
Mena Chacón, Laydy Mitsu;Sarmiento Sarmiento, Guido Juan;Camargo Salcedo, P...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):357-366 Please log in to see more details
El objetivo de la investigación fue determinar el efecto del abonamiento integral en l... more
Impacto del abonamiento integral en el rendimiento y calidad de fresa (Fragaria x ananassa Duch.) cv. Selva bajo sistema de riego por goteo y cobertura plástica / Impact of the integral fertilizer on strawberry yield and quality (Fragaria x ananassa Duch.)...
Scientia Agropecuaria. October 2017 8(4):357-366
El objetivo de la investigación fue determinar el efecto del abonamiento integral en la calidad y rendimiento de fresa cv. Selva, su incidencia en la tasa de respiración y fertilidad del suelo; se realizó en el fundo Santa Teresa de Cayma, Arequipa Perú. Los tratamientos resultaron de integrar 3 niveles de abonamiento químico: 0%; 50% y 100% de la formulación: 200 N, 60 K2O y 60 P2O5 y 3 niveles de abonamiento orgánico: 0%; 50% y 100% de la formulación: 100 L de Humega, 12 L de Bioflora Phos y 60 L de Bioflora Potash; evaluándose 9 tratamientos con 3 repeticiones, en diseño de bloques completos al azar; con arreglo factorial 3 x 3. No hubo efecto estadístico significativo sobre la calidad de frutos. El tratamiento con 50% de abonamiento químico y 50% orgánico logró el mayor rendimiento de frutos de fresa (17114,63 kg·ha-1) siendo 13,25% de categoría extra; 57,62% de primera; 25,18% de segunda; 2,06% de tercera y 1,90% de descarte. La tasa de respiración y la fertilidad del suelo no mostraron diferencia estadística significativa; excepto a 80 días del trasplante, donde el abonamiento orgánico al 100% incrementó la tasa de respiración.
The objective of the research was to determine the effect of integral fertilization on fruit quality and yield of strawberry cv. Selva, its incidence in the respiration rate and soil fertility; it was carried out in the Santa Teresa farm of Cayma, Arequipa Peru. The treatments resulted from integrating 3 levels of chemical fertilization: 0%; 50% and 100% of the formulation: 200 N, 60 K2O and 60 P2O5 and 3 levels of organic fertilization: 0%; 50% and 100% of the formulation: 100 L of Humega, 12 L of Bioflora Phos and 60 L of Bioflora Potash; evaluating 9 treatments with 3 repetitions, in randomized complete block design with factorial arrangement 3 x 3. There was no significant statistical effect on fruit quality. The treatment with 50% of chemical fertilization and 50% of organic fertilization achieved the highest yield of strawberry fruits (17 114.63 kg · ha-1) being 13.25% of extra category; 57.62% of first; 25.18% of second; 2.06% of third and 1.90% of waste. The respiration rate and soil fertility showed no significant statistical difference; except at 80 days after the transplant, where 100% organic fertilization increased the respiration rate.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Integral fertilization - Fragaria x ananassa - quality - yield - soil fertility - Abonamiento integral - calidad - rendimiento - fertilidad del suelo

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Efecto del aceite esencial de Cymbopogon citratus sobre propiedades fisicoquímicas en películas de quitosano / Effect of essential oil of Cymbopogon citratus in the physicochemical properties of quitosan films
Vázquez-Briones, María del Carmen;Guerrero-Beltrán, José Ángel
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):401-409 Please log in to see more details
Se investigó el efecto de la incorporación de aceite esencial de zacate limón (Cymbopo... more
Efecto del aceite esencial de Cymbopogon citratus sobre propiedades fisicoquímicas en películas de quitosano / Effect of essential oil of Cymbopogon citratus in the physicochemical properties of quitosan films
Scientia Agropecuaria. October 2017 8(4):401-409
Se investigó el efecto de la incorporación de aceite esencial de zacate limón (Cymbopogon citratus), en concentraciones de 0, 200 y 400 ppm, en las propiedades fisicoquímicas (espesor, humedad, solubilidad, permeabilidad al vapor de agua, color, transparencia) y mecánicas (resistencia a la tensión y elongación) de películas de quitosano a dos concentraciones (1 y 3%). Los resultados mostraron un efecto significativo (p ≤ 0,05) en los valores del espesor de las películas a las dos concentraciones de quitosano. Se observó un efecto significativo (p ≤ 0,05) en los valores de humedad a concentraciones de 0, 200 y 400 ppm de aceite esencial. La adición de aceite esencial en películas de quitosano mostró un efecto significativo (p ≤ 0,05) en los valores de permeabilidad al vapor de agua. La concentración de quitosano mostró un efecto significativo (p ≤ 0,05) en transparencia y en los parámetros de color L*, a*, b*. Al variar la concentración de quitosano se observó un incremento significativo (p ≤ 0,05) en los valores de resistencia a la tensión de las películas de quitosano
The effect of the incorporation of lemon grass (Cymbopogon citratus) essential oil at concentrations of 0, 200 and 400 ppm in the physicochemical (thickness, moisture, solubility, water vapor permeability, color, transparency) and mechanical properties (tensile strength and elongation) of chitosan films at concentrations of 1 and 3% was assessed. Results showed a significant effect (p ≤ 0.05) on the thickness values of films at concentrations of 1 and 3% of chitosan. A significant effect (p ≤ 0.05) was observed in the moisture content at concentrations of 0, 200 and 400 ppm of essential oil. The addition of essential oil to chitosan films showed a significant change (p ≤ 0.05) in the water vapor permeability values. The chitosan concentration showed a significant effect (p ≤ 0.05) on transparency and the L*, a*, and b* color parameters. By varying the chitosan concentration, a significant increase (p ≤ 0.05) in the tensile strength values of the chitosan films was observed

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - edible films - chitosan - Cymbopogon citratus - mechanical properties - color - películas comestibles - quitosano - propiedades mecánicas

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[Untitled]
Fardim Christo, Bruno;Luis Olivas, Dionicio Belisario;Abeldt Erlacher, Well...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):431-436 Please log in to see more details
[Untitled]
Scientia Agropecuaria. October 2017 8(4):431-436

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Gossypium barbadense - sustainable development - nutritional aspect - desenvolvimento sustentável - aspecto nutricional

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Aislamiento, propagación y crecimiento de hongos comestibles nativos en residuos agroindustriales / Isolation, propagation and growth of native edible fungi in agroindustrial residues
Ríos-Ruiz, Winston Franz;Valdez-Nuñez, Renzo Alfredo;Jiménez-Flores, Juan P...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):327-335 Please log in to see more details
La investigación tuvo como objetivo aislar el micelio secundario de Auricularia spp y ... more
Aislamiento, propagación y crecimiento de hongos comestibles nativos en residuos agroindustriales / Isolation, propagation and growth of native edible fungi in agroindustrial residues
Scientia Agropecuaria. October 2017 8(4):327-335
La investigación tuvo como objetivo aislar el micelio secundario de Auricularia spp y Pleurotus spp procedente de tres áreas naturales de la región San Martín, así como evaluar el crecimiento en medio agar papa dextrosa y en sustratos estériles a base de residuos agroindustriales. Se obtuvieron 10 aislamientos de micelios secundarios a través de carpóforos desinfectados de Pleurotus spp y otros 10 aislamientos de carpóforos desinfectados de Auricularia spp. La mayor velocidad de crecimiento en Auricularia spp fue de 62,5 µm h-1 (A1) y de 75 µm h-1 (B10) para Pleurotus spp. En una segunda parte del experimento se produjo semilla de las cepas nativas más veloces en granos de maíz esterilizado durante un periodo de incubación de 40 días. La semilla fue inoculada en sustratos estériles a base de residuos agroindustriales. Las cepas A1 de Auricularia spp y B10 de Pleurotus spp desarrollaron mejor en sustrato a base de residuos de pulpa de café, logrando una eficiencia biológica de 30,33% y 18,20%, respectivamente. Se concluye que las cepas nativas A1 y B10 de hongos comestibles pueden ser utilizadas en la propagación de semilla y producción de hongos comestibles, brindando al agricultor una alternativa complementaria de alto valor nutritivo.
The objective of the research was to isolate the secondary mycelium of Auricularia spp and Pleurotus spp from three natural areas of the San Martín region, as well as to evaluate the growth in agar potato dextrose medium and in sterile substrates based on agro industrial residues. Ten isolates of secondary mycelia were obtained through disinfected carpophores of Pleurotus spp and another 10 isolates of disinfected carpophores of Auricularia spp. The highest growth rate in Auricularia spp was 62,5 µm h-1 (A1) and 75 µm h-1 (B10) for Pleurotus spp. In a second part of the experiment, seed of the fastest strains was produced in sterilized maize grains during a 40-day incubation period. The seed was inoculated into sterile substrates based on agro industrial residues. The native strains A1 of Auricularia spp and B10 of Pleurotus spp developed better in substrate based on coffee pulp residues, achieving a biological efficiency of 30.33% and 18.20%, respectively. It is concluded that the native strains A1 and B10 of edible fungi can be used in seed propagation and edible fungus production, providing the farmer with complementary food of high nutritional value.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Auricularia spp - Pleurotus spp - biological efficiency - coffee pulp - rice husk - eficiencia biológica - pulpa de café - cascarilla de arroz

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Aplicación de modelos cinéticos no estructurados en el modelamiento de la fermentación láctica de subproductos de pesca / Application of unstructured kinetic models in the lactic fermentation modeling of the fishery by-products
Solano-Cornejo, Miguel Ángel;Vidaurre-Ruiz, Julio Mauricio
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):367-375 Please log in to see more details
En el presente trabajo se evaluaron cinco modelos en su capacidad de predecir la cinét... more
Aplicación de modelos cinéticos no estructurados en el modelamiento de la fermentación láctica de subproductos de pesca / Application of unstructured kinetic models in the lactic fermentation modeling of the fishery by-products
Scientia Agropecuaria. October 2017 8(4):367-375
En el presente trabajo se evaluaron cinco modelos en su capacidad de predecir la cinética de producción de ácido en la fermentación láctica de sub productos de pesca. Los modelos no estructurados evaluados fueron: Gompertz, Baranyi-Roberts, Özilgen, Peleg y Vasquez-Murado. La evaluación estadística entre modelos comprendió la Suma Cuadrado del Error (SCE), la Prueba de Fisher y los Índices de Sesgo y Precisión de Ross. Los modelos que presentaron menores valores de SCE, ausencia de diferencias significativas entre sí (p < 0,05) y mejores Índices de Sesgo y Precisión fueron el modelo empírico de Gompertz y el modelo mecanicista de Baranyi-Roberts, ello debido a su capacidad de modelar curvas simétricas y asimétricas en el primer caso y a su flexibilidad a diferentes condiciones en el segundo caso. El modelo empírico de Peleg y modelo logístico de Vasquez-Murado no lograron dar un ajuste adecuado para el tipo de fermentación láctica analizada. La diferencia en la capacidad predictiva entre los modelos ensayados se debió a que la fermentación se realizó con un arrancador de dos cepas con diferentes velocidades de producción de ácido láctico, lo que generó una curva de producción de ácido láctico con una asimetría que los modelos de Peleg y Vasquez-Murado no lograron fijar en forma adecuada.
In the present work, five models were evaluated in their ability to predict the kinetics of acid production in the lactic fermentation of sub-fishery products. The non-structured models evaluated were from the Gompertz, Baranyi-Roberts, Özilgen, Peleg and Vasquez-Murado models. Statistical evaluation of models included the Residual Sum of Square (SCE), Fisher's Test and Ross's Bias and Precision Indices. The models that presented lower values of SCE, absence of significant differences between them (p < 0.05) and better Bias and Precision Indices were the empirical models of Gompertz and the mechanistic model of Baranyi-Roberts, due to their ability to model symmetric and asymmetric curves in the first case, and their flexibility to different conditions in the second case. The Peleg empiric model and Vasquez-Murado logistic model failed to provide adequate fit for the type of lactic fermentation analyzed. The difference in the predictive capacity of the tested models was due to the fact that the fermentation was carried out with a starter of two strains with different rates of production of lactic acid, which generated a production curve with an asymmetry that the models of Peleg and Vasquez-Murado failed to fix properly.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Lactic Fermentation - Kinetics - Non-Structured Models - Gompertz model - Baranyi-Roberts model - Fermentación láctica - cinética - modelos no estructurados - modelo de Gompertz - modelo de Baranyi-Roberts

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Efecto de la harina de hojas de Erythrina sp. sobre el perfil bioquímico, parámetros biológicos e histopatología del hígado de Cavia porcellus / Effect of the Erythrina sp. leaves powder on biochemical profile, biological parameters and liver histopathology...
Paredes-López, Daniel;Robles-Huaynate, Rizal;Córdova-Chumbes, Orlando;De la...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):297-304 Please log in to see more details
El objetivo de este estudio fue determinar el efecto de la harina de hojas de Erythrin... more
Efecto de la harina de hojas de Erythrina sp. sobre el perfil bioquímico, parámetros biológicos e histopatología del hígado de Cavia porcellus / Effect of the Erythrina sp. leaves powder on biochemical profile, biological parameters and liver histopathology...
Scientia Agropecuaria. October 2017 8(4):297-304
El objetivo de este estudio fue determinar el efecto de la harina de hojas de Erythrina sobre los perfiles bioquímicos, parámetros biológicos y tejido hepático de Cavia porcellus. Se utilizaron 75 cuyes machos de 13 días de edad, formándose 5 grupos experimentales con tres repeticiones cada uno. Todos se alimentaron con 100 g/día de King grass y alimento balanceado para cuyes ad libitum. Las hojas con peciolo se secaron y se molturaron a 1 mm de diámetro. La sangre se obtuvo a los 75 días de edad de la vena safena lateral y en suero sanguíneo se determinó perfiles de glucosa, proteína total, albumina, aspartato aminotrasferasa, alanino aminotransferasa, lactato deshidrogenasa y urea. Trozos de hígado se procesaron hasta obtener los cortes histológicos. Los perfiles de proteína total y albumina mostraron regresión lineal positiva (p < 0,05), el rendimiento de carcasa regresión lineal negativa (p < 0,05) y la estructura histológica del hígado no tuvo cambios a medida que incrementó el nivel de harina de Erytrhina en la ración. La Erythrina causó una respuesta contrastante entre los perfiles de proteína total y albumina en sangre y el rendimiento de carcasa y no causó alteración estructural del hígado
The aim of this research was to determine the effect of Erythrine leaves powder on serum biochemical profiles, biological parameters and liver histopathology of Cavia porcellus. 75 thirteen days old male guinea pig distributed in five groups with three replicates each were used. All groups were fed with 100 g/day of king grass and balanced diet ad libitum. Erythrine leaves including petiole were dried, grounded to 1 mm diameter and added to the diet. Blood was obtained from the lateral saphenous vein and in blood serum was measured glucose, total protein, albumin, alanine aminotransferase, aspartate aminotransferase, lactate dehydrogenase and urea. Liver tissue were processed and stained with hematoxylin and eosin. A positive linear regression in the total protein and albumin (p < 0.05) and a negative linear regression for carcasses (p < 0.05) perfomance and no changes in the liver histologic morphology in relation to the increase of Erythrin leaves flour in the diet were shown. Erythrina caused a contrasting response between total protein and albumin profiles in blood and carcass yield and did not cause structural alteration of the liver

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Erythrina - biochemical profile - biological parameters - liver tissue - perfiles bioquímicos - parámetros biológicos - tejido hepático

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PCR en tiempo real para el sexaje y análisis citológico de la sinapsis del bivalente más pequeño en espermatocitos en paquiteno de Oreochromis niloticus / Real-time PCR for sexing and cytological analysis of the synapsis of the smallest bivalent in pachytene...
Prieto, Zulita;Arqueros, Monica;Sánchez-Tuesta, Linda;Salirrosas, David
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):337-347 Please log in to see more details
El objetivo de la presente investigación fue dar a conocer nuevos marcadores molecular... more
PCR en tiempo real para el sexaje y análisis citológico de la sinapsis del bivalente más pequeño en espermatocitos en paquiteno de Oreochromis niloticus / Real-time PCR for sexing and cytological analysis of the synapsis of the smallest bivalent in pachytene...
Scientia Agropecuaria. October 2017 8(4):337-347
El objetivo de la presente investigación fue dar a conocer nuevos marcadores moleculares para la PCR en tiempo real asociados a los cromosomas sexuales y el análisis de la sinapsis del bivalente más pequeño en espermatocitos en paquiteno de Oreochromis niloticus. Se diseñaron cuatro pares de cebadores y se pusieron a prueba por PCR punto final y por PCR en tiempo real utilizando el fluorescente SYBR® Green en muestras de ADN de hembras XX, machos XY y supermachos YY. Los tamaños de los fragmentos amplificados por PCR punto final fueron concordantes a los valores esperados y por PCR en tiempo real se demostró igual especificidad pero con ventaja en rapidez en la detección de amplificación de marcadores asociados a los cromosoma X y Y, de acuerdo con las condiciones de la PCR establecidas. Las diferencias genéticas entre las regiones de los cromosomas X y Y demostradas con los marcadores específicos no fueron perceptibles citológicamente en los espermatocitos en paquiteno de O. niloticus XY. En base a las diferencias y homologías de las secuencias de ADN entre las accesiones KC710223 y KC710224 de los cromosomas X y Y se propone un modelo de sinapsis del bivalente XY.
The aim of the present study was to report new molecular markers for real-time PCR associated with X and Y sex chromosomes, and perform analysis of the synapsis of the smallest bivalent in pachytene spermatocytes of XY male Oreochromis niloticus. Four pairs of primers were designed and were tested by endpoint PCR and real-time PCR using SYBR Green detection system in DNA samples from XX females, XY males and YY supermales. In order to assess the smallest bivalent synapsis, testicular samples from XY males were used to make chromosomal spreads in pachytene. Size range of fragments amplified by endpoint PCR was concordant with the expected values. Real-time PCR assay showed equal specificity but speed advantage in amplification detection of markers associated with X and Y chromosomes according to the established PCR conditions. Genetic differences between regions of the X and Y chromosomes (smallest bivalent) proven with specific markers were not cytological perceptible in pachytene spermatocytes from XY O. niloticus. A model of XY bivalent synapse was suggested based on the DNA sequences homologies and differences between KC710223 and KC710224 accessions from X and Y chromosomes.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Oreochromis niloticus - tilapia - PCR en tiempo real - determinación del sexo - paquiteno - real-time PCR - sex determination - pachytene

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[Untitled]
Espinoza Aguilar, Mario Sergio;Gómez Villacorta, Elvia Mercedes;Quispe Cont...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):411-417 Please log in to see more details
[Untitled]
Scientia Agropecuaria. October 2017 8(4):411-417

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - sirimbache - anthocyanins - phenolic compounds - berries - nutraceuticals

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Aislamiento de péptidos inhibidores de bacterias a partir de bacterias ácido lácticas del tracto digestivo del lechón e identificación mediante prueba proteómica / Isolation of bacterial inhibitory peptides from lactic acid bacteria of the piglet digestive...
Sánchez Suárez, Héctor;Ochoa Mogollón, Gloria;Rojas Mogollón, Carmen;Peralt...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):437-443 Please log in to see more details
En la alimentación porcina se usan antibióticos los cuales son un riesgo latente para ... more
Aislamiento de péptidos inhibidores de bacterias a partir de bacterias ácido lácticas del tracto digestivo del lechón e identificación mediante prueba proteómica / Isolation of bacterial inhibitory peptides from lactic acid bacteria of the piglet digestive...
Scientia Agropecuaria. October 2017 8(4):437-443
En la alimentación porcina se usan antibióticos los cuales son un riesgo latente para la salud animal y pública. Los microorganismos son adquiridos del entorno durante las diferentes etapas de su vida, algunas bacterias que colonizan y logran ser parte de la flora natural digestiva ejercen acción antibiótica (sustancias extracelulares llamadas bacteriocinas), las cuales se obtuvieron de sustancias extracelulares de ocho bacterias ácido lácticas (BAL) nativas aisladas de dos lechones (Sus scrofa domesticus); las BAL se identificaron mediante pruebas bioquímicas y pruebas de antagonismo frente a Escherichia fergunsonii y Shigella sannei. La identificación molecular de las bacterias y la sustancia proteica se realizó mediante proteómica, por el método Q proteome™ (método de extracción de la proteína directamente del cultivo de bacterias) donde inicialmente se realizó la digestión bacteriana con el Kit, los productos se sometieron a migraciones, en el gel de policrilamida, seleccionando aquellas de 5 a 2500 KD cortados del gel y una segunda digestión con método convencional con tripsina. Los productos fueron analizados mediante espectrometría de masas en Maldi TOF TOF, obteniendo fragmentos de péptidos que fueron comparados molecularmente a organismo pertenecientes al género Bacillus y luego con Lactobacillus, donde se encontró dos péptidos, llamado ornithine monooxygenase ( Bacillus firmus) y RNase J family beta-CASP ribonuclease (Lactobacillus saerimneri) péptidos que tienen efecto inhibidor de bacterias, antimicrobiano que pueden ser bacteriocinas
In pig feed antibiotics are used which are a latent risk to animal and public health. Microorganisms are acquired from the environment during different stages of life, some bacteria that colonize and become part of the natural digestive flora and exert antibiotic action (extracellular substances called bacteriocins), Extracellular substances of eight lactic acid bacteria native to the digestive tract (Sus scrofa domesticus) were isolated from two post weaned piglets; BALs were identified by biochemical tests and tests of antagonism against Echerichia fergunsonii and Shigella sannei. The molecular identification of the bacteria and the protein substance was performed proteomically mediated by the Q proteome ™ method (method of extraction of the protein directly from the culture of bacteria) where the bacterial digestion was initially performed with the Kit, the products were subjected to Migrations in the polycrylamide gel, selecting those of 5 and 2500 KD cut from the gel and a second digestion with conventional trypsin method. The products were analyzed by mass spectrometry in Maldi TOF TOF, obtaining fragments of peptides that were molecularly compared to organisms belonging to Bacillos and later with genus Lactobacilli, where two peptides named ornithine monooxygenase (Bacillus firmus) and RNase J family Beta-CASP ribonuclease (Lactobacillus saerimneri) peptides that have antimicrobial, inhibitory effect of bacteria that can be bacteriocins

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Bacteriocin - proteomics - antagonisms - BAL - native bacteria - bacteriocina - proteómica - antagonismos - bacterias nativas

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YY super males have better spermatic quality than XY males in red tilapia Oreochromis niloticus
Salirrosas, David;Leon, Julio;Arqueros-Avalos, Monica;Sanchez-Tuesta, Linda...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):349-355 Please log in to see more details
YY super males have better spermatic quality than XY males in red tilapia Oreochromis niloticus
Scientia Agropecuaria. October 2017 8(4):349-355

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AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Oreochromis niloticus - tilapia - spermatic quality - YY males

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Development of functional cookies with wheat flour, banana flour (Musa paradisiaca ), sesame seeds (Sesamum indicum ) and storage stability
Loza, Angélica;Quispe, Merly;Villanueva, Juan;P. Peláez, Pedro
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):315-325 Please log in to see more details
Functional cookies were developed using banana flour (BF) and sesame seeds (SS). Prote... more
Development of functional cookies with wheat flour, banana flour (Musa paradisiaca ), sesame seeds (Sesamum indicum ) and storage stability
Scientia Agropecuaria. October 2017 8(4):315-325
Functional cookies were developed using banana flour (BF) and sesame seeds (SS). Protein, moisture and ash were determined, and farinographic analyzes of flours were performed. The attributes odor, color, flavor, crunch and the IC50 value of the cookies were determined. The results were evaluated with the Complete Randomized Design and the Tukey and Kruskall Wallis test. The flour mixture presented higher protein (10.2%), humidity (14.40%) than BF, but lower than wheat flour. Cookies with 10%, 15% and 20% BF and 8% sesame seeds were selected. Flours with 10%, 15% and 20% BF had similar values of water absorption (≤ 60%) and different values statistically (p ≤ 0.05) for development time, mass stability and degree of softening. Cookies with 20% BF and 8% SS (SC) had IC50 = 17.52 ± 0.25 mg / mL, with moisture, protein, fat, crude fiber, ash and carbohydrates of 1.88%, 10.65%, 22.01%, 1.01%, 1.54% and 62.91%, respectively. SC did not present sensorial statistical differences (p ≤ 0.05) the first two months, the third month decreased the acceptability of the crunch and flavor. In ninety days of storage the IC50 value (29.07 ± 0.92 mg / mL), reducing sugars (1.20 ± 0.02) and pH (5.24 ± 0.01) decreased and humidity (3.83 ± 0.03) increased.

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AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - functional cookies - wheat flour - banana flour - sesame

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Bocadito con alto contenido proteico: un extruido a partir de quinua (Chenopodium quinoa Willd.), tarwi (Lupinus mutabilis Sweet) y camote (Ipomoea batatas L.) / High-protein snack: an extruded from quinoa (Chenopodium quinoa Willd.), tarwi (Lupinus mutabilis...
Pérez Ramos, Katherine;Elías Peñafiel, Carlos;Delgado Soriano, Víctor
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):377-388 Please log in to see more details
La presente investigación tuvo como objetivo la elaboración de un bocadito extruido de... more
Bocadito con alto contenido proteico: un extruido a partir de quinua (Chenopodium quinoa Willd.), tarwi (Lupinus mutabilis Sweet) y camote (Ipomoea batatas L.) / High-protein snack: an extruded from quinoa (Chenopodium quinoa Willd.), tarwi (Lupinus mutabilis...
Scientia Agropecuaria. October 2017 8(4):377-388
La presente investigación tuvo como objetivo la elaboración de un bocadito extruido de elevado tenor proteico, a partir de quinua (Chenopodium quinoa Willd.), tarwi (Lupinus mutabilis Sweet) y fécula de camote (Ipomoea batatas L.). Para su formulación se aplicó el método de diseño de mezclas usando la herramienta computacional estadística Design Expert® versión 7.0, siendo las variables independientes las harinas de quinua, tarwi y fécula de camote; y las variables dependientes el contenido de proteína, índice de expansión, densidad aparente y dureza de los extruidos. La formulación óptima se determinó aplicando la prueba de deseabilidad basada en los modelos de regresión ajustado, dicha formulación se obtuvo maximizando el contenido de proteína e índice de expansión; y minimizando la dureza y densidad aparente de los extruidos. La formulación óptima tuvo un porcentaje de quinua, tarwi y fécula de camote de 57%, 26% y 17 % respectivamente. El análisis fisicoquímico de la fórmula óptima dio como resultado 20,16% de proteína, 2,19 de índice de expansión, 0,220 g/cm3 densidad aparente y 9,31 N de dureza. La calidad proteica de la formulación óptima fue determinada mediante los ensayos de digestibilidad verdadera y valor biológico verdadero en ratas, obteniéndose 83,5% y 62,9% respectivamente
The aim of this research was to elaborate a high-protein extruded snack from quinoa (Chenopodium quinoa Willd.), tarwi (Lupinus mutabilis Sweet) and sweet potato starch (Ipomoea batatas L.). For its formulation, the mixture design method was applied using Design Expert® 7.0 software. Quinoa, tarwi and sweet potato starch were the independent variables and the dependent variables were the protein content, expansion index, bulk density and hardness of the extrudates. The optimal formulation was determined by applying the test of desirability based on adjusted regression models, this formulation was obtained by maximizing the protein content and expansion index, and minimizing the hardness and bulk density of the extrudates. The optimal formulation was obtained from a mixture of quinoa, tarwi and sweet potato starch of 57%, 26%, and 17% respectively. Physicochemical analysis of the optimal formula resulted in 20.16% protein, 2.19 expansion index, 0.220 g/cm3 bulk density and 9.31 N hardness. The protein quality of the optimal formulation was determined by the assays of true protein digestibility and true biological value in rats, obtaining 83.5% and 62.9%, respectively

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - mixture design - quinoa - tarwi - sweet potato starch - extrusion - diseño de mezclas - quinua - fécula de camote - extrusión

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Are sensory attributes and acceptance influenced by nutritional and health claims of low-sodium salami? Preliminary study with Brazilian consumers
de Almeida, Marcio Aurélio;Montes Villanueva, Nilda Doris;Saldaña, Erick;da...
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):389-399 Please log in to see more details
The first contact between consumers and the food product is usually the packaging and ... more
Are sensory attributes and acceptance influenced by nutritional and health claims of low-sodium salami? Preliminary study with Brazilian consumers
Scientia Agropecuaria. October 2017 8(4):389-399
The first contact between consumers and the food product is usually the packaging and it’s labelling. Therefore, it is the primary means to generate consumer’s expectations. The aim of the present work was to evaluate the influence of nutritional and health claims on acceptance of salami with reduced sodium content, aimed at finding guidance for the product reformulation. Sixty consumers evaluated four samples of salami. The overall acceptance was evaluated using a nine-point hedonic scale, and the attributes color, tenderness, characteristic flavor and salt content, were evaluated by 7 - point just-about-right (JAR) scale. For the expectation test, overall liking of salami with reduced sodium content was evaluated by consumers under three conditions: (1) blind test (B); (2) expectation generated by nutritional and health claims (E), and (3) consumers re-tasted the salami having the nutrition and health claims available (R). Student’s t-tests performed on data indicated no significant differences (p > 0.05) between the mean acceptance under the blind (B) and real (R) conditions, although expectation ratings (E) were significantly higher than (B) (p ≤ 0.05). However, linear regression of (R - B) x (E - B) ratings revealed a major assimilation effect of expectation, especially under negative disconfirmation (E > B). Contrast effect was also observed, but to a lesser extent. The results showed that saltiness attribute was not decisive in decreased acceptance according to the JAR scale, but it was relevant in the aftertaste generated by adding salt substitutes. Finally, nutritional and health claims had little effect on consumer acceptance.

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AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - nutrition and health claims - expectation test - consumers’ behavior - reduced sodium content - meat product

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Identificación de parásitos en paiches 'Arapaima gigas' juveniles / Identification of parasites in youth paiches 'Arapaima gigas'
Tafur Zevallos, Lisandro;Cotrina, Marcelo
Academic Journal Academic Journal | Scientia Agropecuaria. October 2017 8(4):305-314 Please log in to see more details
El objetivo de este estudio fue identificar parasitosis en paiches juveniles "Arapaima... more
Identificación de parásitos en paiches 'Arapaima gigas' juveniles / Identification of parasites in youth paiches 'Arapaima gigas'
Scientia Agropecuaria. October 2017 8(4):305-314
El objetivo de este estudio fue identificar parasitosis en paiches juveniles "Arapaima gigas", criados en cautiverio en el instituto de Investigaciones de la Amazonia Peruana (IIAP-Ucayali) Perú. En una población de 190 juveniles se tomó una muestra al azar de 50 ejemplares de 2,5 años de edad. La técnica de evaluación fue visual-directa y microscópica. Se identificaron 5 ectoparásitos: Trichodina sp. (Protozoario ciliado), Dolosp sp. (Crustáceo), Dawestrema cycloancistrium (Monogeneo), Dawestrema cycloancistroides (Monogeneo) y Placobdella sp. (Sanguijuela); se encontraron 3 endoparásitos: Nilonema senticosum (Nemátodo), Caballerotrema sp. (Tremátodo) y Gymnodinium sp. (Protozoario flagelado); no se identificaron hemoparásitos en los frotis sanguíneos. Los parásitos se localizaron en los siguientes órganos: filamentos branquiales (Trichodina sp. Dawestrema cycloancistrium y Dawestrema cycloancistroides), piel y aletas (Trichodina sp., Placobdella sp. y Dolosp sp.), vejiga aerífera o seudo pulmón (Nilonema senticosum), intestino (Caballerotrema sp.) y estómago (Gymnodinium sp.).
The aim of this research was to identify parasitosis in juvenile paiches "Arapaima gigas", raised in captivity at the Peruvian Amazon Research Institute (IIAP-Ucayali), Peru. In a population of 190 juveniles, a random sample of 50 individuals of 2.5 years of age was taken. The evaluation technique was visual-direct and microscopic. 5 ectoparasites were identified: Trichodina sp. (Protozoan cilia), Dolosp sp. (Crustacean), Dawestrema cycloancistrium (Monogeneo), Dawestrema cycloancistroides (Monogeneo) and Placobdella sp. (Leech); 3 endoparasites were found: Nilonema senticosum (Nemátodo), Caballerotrema sp. (Tremátodo) and Gymnodinium sp. (Protozoario flagellate); no hemoparasites were identified in the blood smears. Parasites were found in the following organs: gill filaments (Trichodina sp. Dawestrema cycloancistrium and Dawestrema cycloancistroides), skin and fins (Trichodina sp., Placobdella sp. and Dolosp sp.), aerial bladder or pseudo lung (Nilonema senticosum), intestine (Caballerotrema sp.) and stomach (Gymnodinium sp.).

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Arapaima gigas - Dawestrema - Trichodin - Nilonema

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Prueba de conductividad eléctrica en la evaluación de la calidad fisiológica de semillas en berenjena (Solanum melongena L.) / Electrical conductivity test in the evaluation of physiological quality in seeds of eggplant (Solanum melongena L.)
Araméndiz-Tatis, H;Cardona-Ayala, C;Alzate-Román, K
Academic Journal Academic Journal | Scientia Agropecuaria. July 2017 8(3):225-231 Please log in to see more details
El objetivo fue evaluar el número de semillas y tiempo de imbibición a través de la co... more
Prueba de conductividad eléctrica en la evaluación de la calidad fisiológica de semillas en berenjena (Solanum melongena L.) / Electrical conductivity test in the evaluation of physiological quality in seeds of eggplant (Solanum melongena L.)
Scientia Agropecuaria. July 2017 8(3):225-231
El objetivo fue evaluar el número de semillas y tiempo de imbibición a través de la conductividad eléctrica, para conocer el potencial fisiológico de semillas de berenjena. Se utilizó el diseño completamente al azar con arreglo factorial 2x2x5 (variedades CO015 y CO029), (cantidades de semillas de 50 y 100) y (tiempos de imbibición de 2, 4, 6, 8 y 10 horas); con cuatro repeticiones. La calidad fisiológica de las semillas para las condiciones iniciales arrojó porcentajes de germinación del 81,20 y 98,30 para siete y 14 días e índices de velocidad de emergencia con valores de 15,76 y 16,64 para los cultivares CO029 y CO015. En lo pertinente a la conductividad eléctrica, 100 semillas con seis horas es lo ideal para su aplicación. El análisis de regresión arrojó respuesta lineal para el cultivar CO029 con liberaciones de electrólitos de 0,32 y 0,48 μS cm-1 g-1 por hora, respectivamente para 50 y 100 semillas; en tanto que el cultivar CO015, respuesta cúbica con respuesta lineal de 3,40 y 4,25 μS cm-1 g-1 por hora y reducciones de -0,55 y -0,62 μS cm-1 g-1 por hora, como reflejo del mayor deterioro de las semillas a cantidades de 50 y 100, respectivamente
The objective was to evaluate the effect of seed number and imbibition time through the electrical conductivity test, to know the physiological potential of eggplant seeds. We used the completely randomized design with factorial arrangement 2x2x5 (varieties CO015 and CO029), (seed quantities of 50 and 100) and (imbibition times of 2, 4, 6, 8 and 10 hours); With four replicates. The results of the physiological quality of the seeds for the initial conditions yielded germination percentages of 81.20 and 98.30 for seven and 14 days and indexes of emergency speed with values of 15.76 and 16.64 for the cultivars CO029 and CO015, reflecting their low metabolic activity in storage. As regards electrical conductivity, the number of seeds for application is 100 with an imbibition time of six hours. Regression analysis yielded a linear response for cultivar CO029 with electrolyte releases of 0.32 and 0.48 μS cm-1 g-1 per hour, respectively for 50 and 100 seeds; While the cultivar CO015, cubic response with linear response of 3.40 and 4.25 μS cm-1 g-1 per hour and reductions of -0.55 and -0.62 μS cm-1 g-1 per hour, reflecting the greater deterioration of the seeds to amounts of 50 and 100, respectively

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Seed quality - temperature - humidity - number of seeds - vigor - Calidad de semilla - temperatura - humedad - número de semillas

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Cuantificación del área de pajonal de las microcuencas de Gocta y Chinata y su potencial como reserva de carbono / Quantification of the tall grass area of the Gocta and Chinata microbasins and their potential as a carbon stock
Oliva, Manuel;Pérez Torres, Robert;Salas, Rolando;Gamarra, Oscar;Leiva, San...
Academic Journal Academic Journal | Scientia Agropecuaria. July 2017 8(3):233-241 Please log in to see more details
Se realizó la cuantificación de las áreas con presencia de pajonales y la cantidad de ... more
Cuantificación del área de pajonal de las microcuencas de Gocta y Chinata y su potencial como reserva de carbono / Quantification of the tall grass area of the Gocta and Chinata microbasins and their potential as a carbon stock
Scientia Agropecuaria. July 2017 8(3):233-241
Se realizó la cuantificación de las áreas con presencia de pajonales y la cantidad de carbono retenida por las mismas. La cuantificación de áreas se realizó mediante la manipulación e interpretación de imágenes satelitales. Para el cálculo de biomasa de los pajonales, se establecieron parcelas de corte (Harvest method), teniendo en cuenta dos cuadrantes de 1 m por 1 m por cada hectárea. Posteriormente, se cortó toda la vegetación cuyas raíces partían del interior del cuadrante, se registró el peso fresco total por metro cuadrado y se colectó una submuestra para su posterior obtención de biomasa seca y su respectiva identificación botánica. Además de ello, se realizó la identificación de las especies vegetales asociadas. Como resultado se generaron mapas de distribución de los pajonales en la zona alta de las microcuencas de las cataratas de Gocta y Chinata. El área de pajonales tiene 46,30 km2, distribuidos entre las microcuencas de Gocta y Chinata, donde predominan las especies vegetales de la familia de las Poaceae, con un porcentaje del 79% de área con cobertura vegetal. Se obtuvieron 10,1 t/ha de carbono.
The quantification of the areas with presence of pajonales and the amount of carbon retained by them were carried out. The quantification of areas was done by the manipulation and interpretation of satellite images. For the biomass calculation of the pajonales, Harvest method were established, taking into account two quadrants of 1 m per 1 m for each hectare. Subsequently, all vegetation whose roots were removed from the interior of the quadrant was recorded, the total fresh weight per square meter was recorded and a sub-sample was collected for the subsequent production of dry biomass and its respective botanical identification. In addition, the identification of the associated plant species. As a result, distribution maps of the tall grass were generated in the high side of the microbasin of the Gocta and Chinata waterfalls. The area of tall grass is 46.30 km2, distributed between the Gocta and Chinata micro-basins, where the plant species of the Poaceae family predominate, with a percentage of 79% of area covered with vegetation. 10.1 t/ha of carbon were obtained.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - waterfall - dry biomass - tall grass - microbasin - global warming - catarata - biomasa seca - pajonal, microcuencas - calentamiento global

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Germinación y crecimiento de Ochroma pyramidale (Cav. ex Lam.) Urb. en Ecuador / Germination and growth of Ochroma pyramidale (Cav. ex Lam.) Urb. in Ecuador
Jiménez Romero, Edwin;Garcías Franco, Luis;Carranza Patiño, Mercedes;Carran...
Academic Journal Academic Journal | Scientia Agropecuaria. July 2017 8(3):243-250 Please log in to see more details
Se evaluó la germinación y crecimiento de semillas de balsa aplicando siete tratamient... more
Germinación y crecimiento de Ochroma pyramidale (Cav. ex Lam.) Urb. en Ecuador / Germination and growth of Ochroma pyramidale (Cav. ex Lam.) Urb. in Ecuador
Scientia Agropecuaria. July 2017 8(3):243-250
Se evaluó la germinación y crecimiento de semillas de balsa aplicando siete tratamientos pre-germinativos: inmersión en HSO4 por 32 minutos, inmersión en agua a 80 °C durante tres minutos, testigo, remojo en agua a 100 °C por 15 minutos, remojo en agua de coco 12 horas, lijado de las semillas hasta que pierdan su brillo natural, calor seco 96 °C durante 5 minutos. Sembradas en siete sustratos utilizando tierra negra sola y combinada con: tamo de arroz, arcilla más arena, humus UTEQ, zeolita, arcilla más ceniza, humus nacaro (humus de Lombriz). Se realizó un diseño completamente al azar (DCA) en un arreglo factorial 7 (sustratos) x 7 (tratamientos pre-germinativos) con tres repeticiones y 10 unidades de observación. A los 28 días el factor (sustrato) que más influyó en el porcentaje de germinación fue tierra negra más zeolita 7 g/k con 17,75%. El tratamiento pre-germinativo (lijado de las semillas) 20,85%. Tierra negra + humus UTEQ 0,70 g k-1 x remojo en agua de coco por 12 horas, mostró 133,11 mm de altura de plántula. Tierra negra + humus UTEQ 0,70 g/k con 3,27 mm de espesor del vástago. El mayor número de hojas (cinco) se obtuvo en el tratamiento tierra negra + inmersión en HSO4
The germination and growth of berry seed (O. pyramidale) at nursery level has been evaluated; applying seven pre-germinative treatments: Immersion in HSO4 for 32 minutes, immersion in water at 80 °C for three minutes, soak in water at 100 °C for 15 minutes, soak in coconut water 12 hours, sanding the seeds, dry heat 96 °C for 5 minutes and the control. Sowed in seven substrates only black soil and combined with: rice paddy, clay plus sand, Humus UTEQ, zeolite, clay plus ash, humus nacaro (worm humus). A completely randomized design (DCA) was performed in a factorial arrangement 7 (substrates) x 7 (pre-germinative treatments) with three replicates and 10 observation units. At 28 days, the factor (substrate) that most influenced the percentage of germination was black soil + zeolite 7 g/kg with 17.75%. The pre-germinative treatment with the highest incidence was the treatment of its natural brightness; the treatment black soil + UTEQ humus 0.70 g/k x soaking in coconut water for 12 hours obtained the best level of seedling height. The neck thickness of higher stem was observed black soil + UTEQ humus 0.70 g/kg. The highest number of leaves (five) obtained the treatment black soil + immersion in HSO4

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Ácido sulfúrico - sustrato - humus UTEQ - humus nacaro y zeolita - Sulphuric acid - substrate - UTEQ humus - humus nacaro y zeolite

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Rendimiento de cosecha de diecisiete cultivares de papa (Solanum tuberosum L.) del grupo Phureja / Harvest performance of seventeen potato cultivar (Solanum tubersosum L.) from the Phureja group
Seminario Cunya, Juan F;Seminario Cunya, Alejandro;Domínguez Palacios, Ante...
Academic Journal Academic Journal | Scientia Agropecuaria. July 2017 8(3):181-191 Please log in to see more details
El objetivo de la investigación fue evaluar el rendimiento de tubérculos y las variabl... more
Rendimiento de cosecha de diecisiete cultivares de papa (Solanum tuberosum L.) del grupo Phureja / Harvest performance of seventeen potato cultivar (Solanum tubersosum L.) from the Phureja group
Scientia Agropecuaria. July 2017 8(3):181-191
El objetivo de la investigación fue evaluar el rendimiento de tubérculos y las variables relacionadas de 17 cultivares de papa del grupo Phureja, de la región Cajamarca-Perú. El experimento se realizó en el valle de Cajamarca (2650 msnm) en diseño de bloques completamente randomizados, con 17 tratamientos (cultivares) y tres repeticiones, sembrados a 0,90 m entre surcos y 0,40 m entre plantas. Se evaluó altura de planta, número de tallos, número y peso total de tubérculos, número y peso de tubérculos comerciales, materia seca de tubérculos y follaje (%), índice de cosecha, gravedad específica y rendimiento de tubérculos por hectárea. Los datos fueron tratados mediante análisis de varianza y prueba de rango múltiple de Tukey (p ≤ 0,05). El rendimiento de tubérculos varió de 8,2 t∙ha-1 a 27,4 t∙ha-1 y el promedio fue de 15,5 t∙ha-1. El índice de cosecha promedio fue de 65%. Los tubérculos comerciales representaron entre 49% y 97%. Los cultivares presentaron diferencias estadísticas altamente significativas en rendimiento por hectárea, altura de planta, número de tallos, número total de tubérculos, número de tubérculos comerciales y peso de tubérculos comerciales. Nueve cultivares fueron estadísticamente similares y superiores al resto, en rendimiento de tubérculos por hectárea. Un cultivar fue superior a todos los demás, en rendimiento de tubérculos comerciales
The objective of the research was to evaluate the yield of tubers and related variables of 17 potato cultivars of the Phureja group from the Cajamarca-Peru region. The experiment was carried out in the Cajamarca Valley (2650 masl) in a randomized complete block design, with 17 treatments (cultivars) and three replications, planted at 0.90 m between rows and 0.40 m between plants. Plant height, number of stems, number and total weight of tubers, number and weight of commercial tubers, dry matter of tubers and foliage (%), crop index, specific gravity and yield of tubers per hectare were evaluated. Data were analyzed using analysis of variance and Tukey's multiple rank test (p ≤ 0.05). The yield of tubers varied from 8.2 t∙ha-1 to 27.4 t∙ha-1 and the average was 15.5 t∙ha-1. The average harvest rate was 65%. Commercial tubers were between 49% and 97%. The cultivars showed highly significant statistical differences in yield per hectare, plant height, number of stems, total number of tubers, number of commercial tubers and weight of commercial tubers. Nine cultivars were statistically similar and superior to the rest, in yield of tubers per hectare. One cultivar was superior to all others, in yield of commercial tubers

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Creole potato - Phureja group - yield - harvest index - Papa criolla - grupo Phureja - rendimiento - índice de cosecha

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Efecto biofungicida del gel de Aloe vera sobre Mycosphaerella fijiensis, agente causal de la Sigatoka negra en Musa (AAA) / In vitro evaluation of the Aloe vera gel on Mycosphaerella fijiensis, causative agent of black Sigatoka disease in Musa (AAA)
Jaramillo Aguilar, Edwin;Barrezueta-Unda, Salomon;Luna Romero, Eduardo;Cast...
Academic Journal Academic Journal | Scientia Agropecuaria. July 2017 8(3):273-278 Please log in to see more details
El objetivo de este trabajo fue evaluar a nivel in vitro la actividad antifúngica del ... more
Efecto biofungicida del gel de Aloe vera sobre Mycosphaerella fijiensis, agente causal de la Sigatoka negra en Musa (AAA) / In vitro evaluation of the Aloe vera gel on Mycosphaerella fijiensis, causative agent of black Sigatoka disease in Musa (AAA)
Scientia Agropecuaria. July 2017 8(3):273-278
El objetivo de este trabajo fue evaluar a nivel in vitro la actividad antifúngica del gel de Aloe vera sobre el crecimiento micelial de Mycosphaerella fijiensis. Se utilizó la técnica de envenenamiento en el medio de cultivo PDA para determinar la actividad antifúngica del gel. El diseño utilizado fue completamente al azar, con siete tratamientos y tres repeticiones. En los tratamientos se utilizó un fungicida químico comercial (propiconazol), a 250 ppm y 500 ppm; un biofungicida comercial (Trichoderma sp.) a 500 ppm y 1000 ppm; ambos productos se usaron como testigo químico y biológico, respectivamente; el gel de Aloe vera a 500 ppm y 1000 ppm; y un testigo absoluto. Se determinó diferencias significativas entre los tratamientos (ANOVA), El test de Tukey demostró que todos los tratamientos registraron diferencia significativa (p ≤ 0,05) con respecto al testigo absoluto. El propiconazol presentó el mayor porcentaje de inhibición del micelio (73,10%); el test de Tukey y el porcentaje de inhibición del micelio presentaron valores similares en el control del crecimiento del hongo a los 30 días de inoculación, en los tratamientos gel de Aloe vera y el T6 de Trichoderma sp. Los resultados sugieren que el Aloe vera podría ser un adecuado biofungicida para el control de Mycosphaerella fijiensis, agente causal de la Sigatoka negra.
The aim of this study was to evaluate in vitro antifungal activity of Aloe vera gel on mycelial growth of Mycosphaerella fijiensis. Poisoning technique was used in PDA growth medium to for determine antifungal activity of gel. The design used was completely random, with seven treatments and three repetitions. In treatments, it was used a commercial fungicide (propiconazole), 250 ppm and 500 ppm; a commercial biofungicide (Trichoderma sp.) at 500 ppm and 1000 ppm; both products were used as chemical and biological control, respectively; Aloe vera gel 500 ppm and 1000 ppm; and an absolute control. significant differences were detected in treatments (ANOVA), Tukey test showed that all treatments registered significant difference (p ≤ 0.05) with respect to absolute control. Propiconazole had the highest inhibition Percentage of mycelium (73.10%), The Tukey test and inhibition percentage of mycelium demonstrated similar values in the control of the fungus growth in the 30 days of the inoculation, in the Aloe vera gel treatments and the T6 Trichoderma sp. The results suggest that Aloe vera could be a suitable biofungicide to control Mycosphaerella fijiensis, causative agent of black Sigatoka.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - gel Aloe vera - Mycosphaerella fijiensis - Musa (AAA) - propiconazol - Trichoderma sp - Aloe vera gel - propiconazole

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[Untitled]
Mercado, Waldemar;Ubillus, Karina
Academic Journal Academic Journal | Scientia Agropecuaria. July 2017 8(3):251-265 Please log in to see more details
The present study aims to categorize quinoa producers and examine and compare quinoa s... more
[Untitled]
Scientia Agropecuaria. July 2017 8(3):251-265
The present study aims to categorize quinoa producers and examine and compare quinoa supply chains in the Peruvian regions of Puno and Junin. This research was conducted in the provinces of San Roman and El Collao in Puno and Jauja and Huancayo in Junin using surveys of producers selected according to stratified sampling, along with interviews and workshops with traders and agents in the supply chain. Cluster analysis was used to examine the producers’ attributes, the supply chain, and the profit margins of conventional and organic producers. In both regions, most producers were small and medium sized (100% in Puno and 91.6% in Junin). The supply chains in Puno and Junin comprised 24 and 31 channels, respectively. It was found that numerous collectors, formal and informal processors, and exporters mainly linked with organized producers participated in these supply chains and this made trade efficient and coordinated. In contrast, trade among individual producers in the domestic markets through agents in the supply chain was highly disjointed, tending toward high centralization and without added value. It is concluded that quinoa supply is complex, centralized, traditional, and somewhat inefficient since asymmetrical relations were found between agents favoring commercial intermediaries.

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AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - quinoa - commercialization - production costs - agricultural markets - supply chains

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Características agronômicas de cultivares de melancia nas condições do cerrado de Roraima, Brasil / Agronomic characteristics of watermelon cultivars in conditions of Roraima cerrado, Brazil
Soares da Silva, Edgley;da Silva Carmo, Ignácio Lund Gabriel;Lopes Monteiro...
Academic Journal Academic Journal | Scientia Agropecuaria. July 2017 8(3):193-201 Please log in to see more details
Objetivou-se com esse trabalho avaliar as características agronômicas de doze cultivar... more
Características agronômicas de cultivares de melancia nas condições do cerrado de Roraima, Brasil / Agronomic characteristics of watermelon cultivars in conditions of Roraima cerrado, Brazil
Scientia Agropecuaria. July 2017 8(3):193-201
Objetivou-se com esse trabalho avaliar as características agronômicas de doze cultivares de melancia produzidas nas condições edafoclimáticas do cerrado de Roraima. O experimento foi desenvolvido no Campo Experimental Água Boa da Embrapa Roraima. O delineamento experimental foi em blocos ao acaso com quatro repetições e seis plantas por parcela. Os tratamentos consistiram das cultivares: Combat, Conquista, Verena, Congo, Magnum, Electra, Santa Amélia, Explore, Emperor, Crimson Select Plus, Charleston Gray Super e Omaru Yamato. Avaliaram-se as características produtivas, de sementes e de qualidade dos frutos. Concluiu-se que as condições edafoclimáticas do cerrado de Roraima favorecem as características produtivas e qualitativas dos frutos das cultivares de melancia analisadas. A maior produtividade foi encontrada no cultivar Crimson Select Plus, com média de 67848,25 kg ha-1. As características de sementes variam em função das cultivares, com maiores quantidades encontradas na ‘Santa Amélia’ e ‘Explore’ e maior massa na ‘Charleston Gray Super’. Quanto à qualidade dos frutos não há diferença no teor de sólidos solúveis entre as cultivares, porém, os valores encontrados são relativamente altos (>10 ºBrix). As cultivares Crimson Select Plus, Santa Amélia e Explore apresentam elevado potencial para cultivo nas condições edafoclimáticas do Cerrado de Roraima-Brasil. Possibilita com as informações obtidas nesse estudo a exploração de novas cultivares, mais produtivas e de superior qualidade, quando comparada às atualmente cultivadas na região. Novos estudos relacionados ao tema devem contemplar a aceitação do mercado consumidor para com as cultivares de maior potencial produtivo obtidas.
The objective of this work was to evaluate the agronomic characteristics of twelve watermelon cultivars produced under the edaphoclimatic conditions of the cerrado of Roraima. The experiment was developed at the Embrapa Roraima Experimental Water Field. The experimental design was in randomized blocks with four replications and six plants per plot. The treatments consisted of the cultivars: Combat, Conquista, Verena, Congo, Magnum, Electra, Santa Amelia, Explore, Emperor, Crimson Select Plus, Charleston Gray Super and Omaru Yamato. The productive, seed and fruit quality characteristics were evaluated. It was concluded that the edaphoclimatic conditions of the cerrado of Roraima favor the productive and qualitative characteristics of the fruits of the watermelon cultivars analyzed. The highest productivity was found in the Crimson Select Plus cultivar, with a mean of 67848.25 kg ha-1. The characteristics of seeds vary according to the cultivars, with the largest quantities found in 'Santa Amélia' and 'Explore' and greater mass in 'Charleston Gray Super'. Regarding fruit quality, there is no difference in soluble solids content among cultivars; however, the values found are relatively high (> 10 ºBrix). Crimson Select Plus, Santa Amélia and Explore cultivars present high potential for cultivation in the soil and climate conditions of cerrado de Roraima-Brazil. With the information obtained in this study, it allows the exploration of new cultivars, more productive and of superior quality, when compared to those currently cultivated in the region. New studies related to the subject must contemplate the acceptance of the consumer market for the cultivars with the greatest productive potential obtained.

Subject terms:

AGRICULTURE, MULTIDISCIPLINARY - AGRONOMY - Northern Amazon - Citrullus lanatu - Productivity - Post-harvest - Amazonia setentrional - Citrullus lanatus - Produtividade - Pós-colheita

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