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Search Results: 1 - 10 of 64195 matches for " Antonio Turrent-Fernández "
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RENDIMIENTO DE HíBRIDOS DE MAíZ BAJO DIFERENTES COMBINACIONES DE SEMILLA ANDROESTERIL Y FéRTIL EN MéXICO
Alejandro Espinosa-Calderón,Margarita Tadeo-Robledo,Mauro Sierra-Macías,Antonio Turrent-Fernández
Agronomía Mesoamericana , 2009,
Abstract: El objetivo de este trabajo fue determinar la capacidad productiva de los híbridos comerciales H-48 y Puma 1076 en diferentes mezclas de semilla androesteril y fértil: 1) 100 % semilla androesteril; 2) 90 % semilla androesteril más 10 % semilla fértil; 3) 80 % semilla androesteril más 20 % semilla fértil; 4) 60 % semilla androesteril más 40 % semilla fértil; 5) 40 % semilla androesteril más 60 % semilla fértil; 6) 100 % semilla fértil. Estas combinaciones fueron evaluadas en el ciclo primavera-verano, desde junio a noviembre, durante los a os 2001, 2002 y 2003, en el Campo Experimental Valle de México, a una altitud de 2.250 m. Los experimentos se manejaron con densidad de población de 60.000 plantas/ha. Se utilizó un dise o experimental de bloques completos al azar, y se analizó como factorial. Los factores de variación fueron a os, genotipos, combinaciones de semilla androesteril y fértil, así como las interacciones. El tratamiento 90 % semilla androesteril + 10 % semilla fértil tuvo el rendimiento más elevado (8.738 kg/ha), superó significativamente al testigo 100 % fértil (7.488 kg/ha). La media de los híbridos con esterilidad masculina fue estadísticamente superior en rendimiento de grano con respecto a la versión fértil, lo que representa una ventaja adicional, además de la facilidad para mantener la calidad genética y disminuir los costos en la producción de semilla híbrida de maíz.
FORRAJE Y GRANO DE HíBRIDOS DE MAíZ AMARILLOS PARA VALLES ALTOS DE MéXICO
Margarita Tadeo-Robledo,Alejandro Espinosa-Calderón,Job Zaragoza-Esparza,Antonio Turrent-Fernández
Agronomía Mesoamericana , 2012,
Abstract: El objetivo de este trabajo fue determinar la producción de grano y de forraje en híbridos trilineales amarillos. Se establecieron en el a o 2009 tres experimentos, comparando híbridos trilineales amarillos con híbridos comerciales blancos y el híbrido Búho de Asgrow; dos experimentos en el Campo Experimental de Valle de México del INIFAP, donde se evaluó la productividad de grano y otro en la Facultad de Estudios Superiores Cuautitlán de la Universidad Nacional Autónoma de México, para evaluación de forraje a una densidad de 70 000 plantas/ha. El análisis combinado para rendimiento detectó diferencias altamente significativas para híbridos, sitios y la interacción híbridos x sitios. El coeficiente de variación fue de 17,7% y la media general de 7113 kg/ha. La comparación de medias ubicó en el primer grupo de significancia a los híbridos de grano blanco comerciales Puma 1167 y Puma 1163 con 9549 kg/ha y 8748 kg/ha, respectivamente. Los híbridos amarillos 501X497 y 501X555 fueron superiores 36,0% y 12,4% con respecto a H-48 y el híbrido testigo. Búho presentó similar rendimiento en materia verde, que Puma 1163 y fue superior (P<0,05) a los otros híbridos evaluados. El híbrido Puma 1163 por su buen rendimiento de grano, materia verde y materia seca se sugiere validarlo a nivel comercial en doble propósito.
Propuesta de cotejo de impacto de la acumulación de transgenes en el maíz (Zea mays L.) nativo mexicano
Turrent-Fernández, Antonio;Serratos-Hernández, J. Antonio;Mejía-Andrade, Hugo;Espinosa-Calderón, Alejandro;
Agrociencia , 2009,
Abstract: the liberation of genetically modified maize (gmm) on commercial scale in méxico, potentially involves the genetic interaction among over 30 independent transgenic events (probably more than 30 different transgenic loci) and more than 50 mexican maize landraces (mml) in mexican farmlands. although the law of biosecurity of genetically modified organisms (lbgmo) and its norms establish the assumption that the control of pollen makes it possible to minimize the genetic interaction between the two maizes, it is possible that the "seed-pollen" alternative, not forseen in this law, contradicts the realism of this assumption. the present status of recombinant dna technology does not allow the predetermination of the transgenic locus of each transformation, thus the more than 30 independent transgenic loci of the seed market would be dispersed in the chromosomic space. this is the central cause of transgene accumulation in the mml, when the gmm and the mml interact genetically, with effects that still unknown. this assay proposes a test of the hypothesis of a damage deleterious threshold of transgene accumulation in each mml. the impact of 10 cycles of crosses between the mml and 32 or more transgenic hybrids is discussed, to obtain populations with individuals that accumulate transgenic weights from zero to 32 or more. also it is discussed the biological, agronomic and molecular evaluation of the genotypes under study.
Calidad del fruto del duraznero en el sistema milpa intercalada con árboles frutales en laderas
Santiago-Mejía, Elizabeth;Cortés-Flores, José Isabel;Turrent-Fernández, Antonio;Hernández-Romero, Ernesto;Jaen-Contreras, David;
Agricultura técnica en México , 2008,
Abstract: nutritional status of peach trees affects fruit quality, in peach "diamante" under the milpa system intercropped with fruit trees (miaf) in hillsides, with a similar fertilization on level soils, is variable. then nutritional status and fruit quality as affected by two planting densities (d), two rates of fertilization to maize and beans (f), and two branch position in tree (r) in two locations of san jerónimo tecoatl country, in the state of oaxaca during the year 2005 were evaluated. eight different combinations (factorial 23) were tested in a complete randomized block experimental design with three replicates. foliar analysis in site "santa catarina" indicated that only concentrations of mn and zn were different between treatments, due to effects of interaction d x f x r and by main effect of f, respectively. in site "centro de salud", mg and cu were significantly affected by d and interaction f x r, respectively. total soluble solids were greater than 11.0 °brix and color index was acceptable. however, fruit firmness was lower (0.40-62 kg cm-2) than normal for peach "diamante". nutritional status of trees was unbalanced with high n concentrations, in detriment of fruit firmness.
Efecto de la interacción genotipos × prácticas de manejo sobre el índice de cosecha de híbridos de maíz bajo riego
Barrios-Ayala,Aristeo; Turrent-Fernández,Antonio; Otero-Sánchez,Marco A; Ariza-Flores,Rafael; Michel-Aceves,Alejandro;
Interciencia , 2006,
Abstract: six maize field experiments conducted in southeastern mexico in the 1997-99 period were analyzed in order to evaluate genotype × crop management interaction on harvest index (hi). the validity of using a constant value for hi is questioned in modern hybrids of corn, in order to predict its growth from some modular, dynamics models which are additives and ignores factor interactions. 25 and 27 treatments of a rotatable central composite design for n, p, k, population density and planting date were assigned to main plots of a split plot design replicated twice. small plots were assigned to 3, 4 or 6 maize hybrids that had similar agronomic performance but differing genetic backgrounds. an interactive quadratic model for management factors and maize hybrids was fit by regression for harvest index (hi). dummy variables valued 0 or 1 accounted for maize hybrids. alternatively, a quadratic, additive model that ignored maize genotypes was fitted by regression. results reflected genotype × management interaction that varied significantly among hybrids and locations in the interactive model, causing significant variation in hi. extreme computed hi values were 0.32 and 0.60 for h-515 and hemoc hybrids, respectively. the interactive model consistently improved 14 to 47% the determination coefficient (r2) for hi.
Interacción genotipos X prácticas de manejo en el rendimiento de grano de híbridos de maíz
Barrios-Ayala, Aristeo;Turrent-Fernández, Antonio;Ariza-Flores, Rafael;Otero-Sánchez, Marco;Michel-Aceves, Alejandro;
Agricultura técnica en México , 2008,
Abstract: an alternative to the field method for generating recommendations of management in mexico is the use of modular, dynamic models of crop growth, which are additives in its conception and ignore the genotype. the objetive in this study was: 1) to prove that the recomendations for the use of maize crop cultivation can not be used for all genotypes of maize available for this and 2) data from three maize field experiments conducted in southeastern mexico, san gregorio and villa flores, chiapas and piedras negras, veracruz, was analyzed in order to evaluate the genotype x crop management interactions on grain yield . twenty-five treatments of a rotable, central composite design for n, p, k and population stand were assigned to main plots of a split plot design replicated twice. small plots were assigned to three or four modern maize hybrids that had similar agronomic performance but different genetic background. grain yield was fitted by regression with an additive model that ignored maize genotype and an interactive quadratic model for management factors and maize hybrids, in the last model dummy variables valued 0 or 1 accounted for maize hybrids. results reflected genotype by management interaction that varied significantly among hybrids and locations in the interactive model. the interactive model consistently improved 30% to 71% the determination coefficient (r2) of grain yield as compared to the additive model.
Forraje y grano de híbridos de maíz amarillos para valles altos de México
Tadeo-Robledo,Margarita; Espinosa-Calderón,Alejandro; Zaragoza-Esparza,Job; Turrent-Fernández,Antonio; Sierra-Macías,Mauro; Gómez-Montiel,Noel;
Agronomía Mesoamericana , 2012,
Abstract: in this work the objective was to determine the productivity of grain and forage of five yellow three-way hybrids compared to white hybrids developed by fesc-unam and inifap, and the commercial hybrid buho from asgrow. three experiments were planted during 2009; two in cevamex for evaluating grain yield and the other in the fesc-unam for evaluating forage production. for yield, the combined analysis detected highly significant differences for hybrids, hybrid trials and interaction x trials (p≤0.01). the coefficient of variation was 17.7 per cent and the overall average of 7,113 kg/ha. the white hybrids puma 1167 and puma 1163 had the best grain yielding 9,549 kg/ ha and 8748 kg/ha, respectively. in contrast, the yellow hybrids had a similar performance shown in previous years and represent 136.0% and 112.4% with respect to h-48. the experiment to evaluate forage was planted with a density of 70,000 plants/ha. puma 1163 and buho had better forage production (p≤0.05) than the other hybrids evaluated. hybrid puma 1163 presented good yields of grain, green forage and dry matter by what could be used in dual purpose, grain and forage production.
Rendimiento de las generaciones F1 y F2 de híbridos trilineales de maíz en los valles altos de México
Espinosa-Calderón, A;Tadeo-Robledo, M;Arteaga-Escamilla, I;Turrent-Fernández, A;Sierra-Macías, M;Gómez-Montiel, N;Palafox-Caballero, A;Valdivia-Bernal, R;Trejo-Pastor, V;Canales-Islas, E;
Universidad y ciencia , 2012,
Abstract: in mexico, 25% of improved maize seed and 75% of native seed or improved native varieties (advanced generations of hybrids) are used. the price of the f1 hybrid seed is the highest in the world, limiting its greater use, for which reason farmers use seeds from their own plots of hybrid seeds. in the high valleys of mexico, the maize hybrids most planted are the h-50 and h-48. the purpose of this study was to determine the productivity of the f1 and f2 generations of the hybrids h-48, h-50, h-153 h-50 ae and h-47 ae. they were evaluated during the 2007 spring-summer season in two experiments carried out at the facultad de estudios superiores cuautitlán (fesc) of the unam and the experimental station campo experimental valle de méxico (cevamex) of the inifap. with respect to yield, the combined statistical analysis detected highly significant differences for localities, genotypes and f1 f2 generations, as well as for the interaction genotypes x f1 f2 generations. mean yield was 8 560 kg ha-1 and the coefficient of variation was 18.8%. the mean yield obtained at the cevamex was 10 053 kg ha1. this was statistically different from that recorded in the fesc where a mean of 7 069 kg ha-1 was logged. the f1 generation yielded 9 985 kg ha-1 on average, which represented 139.9% with respect to the f2 generation that produced 7 137 kg ha1. the results indicate that the use of f2 generation seeds is not convenient due to a decrease in productivity, and that the difference in yield justifies acquiring new seeds every season.
Erosión del suelo, escurrimiento y pérdida de nitrógeno y fósforo en laderas bajo diferentes sistemas de manejo en Chiapas, México Soil erosion, runoff and nitrogen and phosphorus losses in hillsides as affected by soil management system in Chiapas, Mexico
Robertony Camas Gómez,Antonio Turrent Fernández,José Isabel Cortes Flores,Manuel Livera Mu?óz
Revista mexicana de ciencias agrícolas , 2012,
Abstract: En Chiapas, México, la erosión del suelo es el principal problema que afecta la sustentabilidad de las tierras de ladera. Como resultado, los rendimientos y los ingresos son bajos y la calidad del suelo continúa disminuyendo. Con el objetivo de encontrar alternativas tecnológicas sostenibles, se evaluaron los sistemas: maíz en labranza de conservación (MLC); maíz en barreras de muro vivo (MBMV) y milpa intercalada con árboles frutales (MIAF), en términos del escurrimiento superficial, producción de sedimentos y pérdida de nitrógeno y fósforo en el periodo de junio a noviembre de 2009. Los sistemas se establecieron en microcuencas adyacentes pertenecientes a la cuenca del río Catarina, Jiquipilas, Chiapas. El suelo es un Typic haplustepts, con una pendiente que varía de 30 a 40%. Del total de las precipitaciones, 54% causaron erosión del suelo, y 15% de estos con una precipitación superior a 40 mm 62% de la erosión total. El coeficiente de escurrimiento y la degradación específica de suelo fueron similares y más bajos en las micro cuencas; MIAF (12, 5.8 t ha-1) y MBMV (13, 6.3 t ha-1) que en la microcuenca con MLC (19, 16.8 t ha-1), respectivamente. En el MIAF, el filtro de escurrimiento y la cobertura total proporcionada por el maíz y el frijol durante la mayor parte de la temporada de crecimiento tuvo un papel importante para obtener esos resultados, no obstante que esa microcuenca presentó mayor grado y longitud de pendiente. En cuanto a los nutrientes se determinó una mayor pérdida de nitratos en la microcuenca con el sistema MBMV, posiblemente debido al aporte de nitrógeno por los residuos de la poda de Gliricidia sepium. Respecto a fósforo, el sistema MIAF presentó una pérdida mayor, atribuyéndose a la fertilización fosfórica anual que se realizó a los árboles de guayaba durante tres a os. In Chiapas, Mexico, soil erosion is the main problem affecting the sustainability of hillside lands. As a result, yields and incomes are low, and soil quality continues to decrease. With the aim of finding sustainable technological alternatives, an evaluation was performed on the following systems: maize in conservation tillage (MLC); maize in plant barriers (MBMV) and maize alternated with fruit trees (MIAF), in terms of surface runoff, production of sediments and loss of nitrogen and phosphorous from June to November, 2009. The systems were set up in adjacent microbasins, belonging to the basin of river Catarina, Jiquipilas, Chiapas. The soil is a Typic haplustepts, with a slope that varies between 3 0 and 40%. Out of the total rainfalls, 54% caused soil erosio
Evaluación automatizada de tierras para el cultivo de ajonjolí en relevo a maíz Automated land evaluation for cropping, maize and sesame in relay intercropping
Robertony Camas Gómez,Antonio Turrent Fernández,Jaime López Martínez,Pedro Cadena I?iguez
Revista mexicana de ciencias agrícolas , 2010,
Abstract: En la Frailesca, Chiapas el cultivo principal es maíz en monocultivo. Este se siembra principalmente en suelos de terraza intermedia, ubicados fisiográficamente entre suelos de vega a orillas de ríos y laderas. El objetivo de este estudio fue generar un modelo para planificar el establecimiento de maíz (Zea mays L.) de temporal y ajonjolí (Sesamun indicum L.) como cultivo en relevo después de maíz. El modelo se generó aplicando la metodología del sistema automatizado de evaluación de tierras de la FAO, ALES versión 4.5. Para esto se recabó información técnica, cartográfica y de campo para hacer una base de datos. El procesamiento de la cartografía se realizó por medio del software Arc View 3.2. Se clasificaron 22 unidades de tierra considerando las características físicas y químicas del suelo. Del área total evaluada el maíz presentó las siguientes aptitudes físicas: apta 2.3%, moderada 28.2%, marginal 50.3% y no apta 19.2%. Para el ajonjolí en relevo; 19.2% apta, 61.5% moderada y 19.2% no apta. Los rendimientos simulados fueron muy similares a las parcelas de validación y demostración establecidas en la región. Se concluyó que del área total evaluada y cultivada con maíz en monocultivo, 80.7% puede intensificarse mediante la introducción de ajonjolí en relevo, y además el sistema automatizado de tierras permite realizar una planificación confiable para el uso del suelo. In the Frailesca, Chiapas, maize is the main crop in monoculture. It is mainly Brown in intermediate terrace soils, located physiographically between lowland soils on river banks and hillsides. The aim of this study was to create a model to plan the establishment of maize (Zea mays L.) as a seasonal crop and sesame (Sesamun indicum L.) as a relay crop after maize. The model was created by applying the FAO methodology for automatic land evaluation, ALES version 4.5. In order to do this, technical, cartographic and field information was gathered in order to create a data base. Maps were processed using the program Arc View 3.2. Twenty two units of land were classified, considering the soil's physical and chemical characteristics. Out of the total area evaluated, maize displayed the following physical aptitudes: adequate 2.3%, moderate 28.2%, marginal 50.3% and inadequate 19.2%. For the relay sesame; 19.2% was adequate, 61.5% moderate and 19.2% inadequate. The simulated yields were very similar to the validation and demonstration parcels established in the area. It was concluded that out of the total area evaluated and cultivated with maize in monoculture, 80.7% can be intensified by intro
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