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Search Results: 1 - 10 of 3736 matches for " Margarita Tadeo-Robledo "
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Rendimiento de semilla de cruzas simples fértiles y androestériles progenitoras de híbridos de maíz
Tadeo-Robledo, Margarita;Espinosa Calderón, Alejandro;Beck, David;Torres, José Luis;
Agricultura técnica en México , 2007,
Abstract: to reduce production costs maize seed multiplication, the use of male sterility is a viable option. researchers at the national research institute for forestry, agriculture and livestock (inifap) and the national autonomous university of mexico (unam), introduced a male sterile gene since 1992 have been pursuing the introduction of this that into maize lines and in the search for fertility restoring lines. the objective of this study was to evaluate seed production and quality of male sterile single crosses and to compare them with their fertile version. the experiment was established at el batan, state of mexico, mexico and tula, hidalgo, in a complete randomized block design with three replicates. during the flowering period the sterility trait was visually verified. no difference in seed production was observed between male sterile and normal versions of the crosses. male sterility increased the percentage of large seeds and in the majority of the crosses the 100 seed weight. the male sterility trait was confirmed on all simple crosses.
DESPANOJADO Y DENSIDAD DE POBLACIóN EN UNA CRUZA SIMPLE ANDROESTéRIL Y FéRTIL DE MAíZ
Alejandro Espinosa-Calderón,Margarita Tadeo-Robledo,Mauro Sierra-Macías,Filiberto Caballero-Hernández
Agronomía Mesoamericana , 2010,
Abstract: En este trabajo el objetivo fue determinar el efecto del despanojado en la productividad de cruzas simples de maíz. Se estableció un experimento durante el ciclo primavera - verano 2004, en el Rancho Almaraz de la Facultad de Estudios Superiores Cuautitlán, de la Universidad Nacional Autónoma de México (FESC-UNAM), ubicado en Cuautitlán Izcalli, México, a 2240 msnm. Se utilizó un dise o experimental de campo en bloques completos al azar con tres repeticiones, el análisis estadístico se efectuó en forma factorial, considerando los factores genotipos (2), densidades de población (3) y el tratamiento de despanojado y sin despanojar (2), así como las interacciones. El rendimiento tuvo diferencias altamente significativas para despanojado, así como significancia estadística para genotipos y densidad de población y la interacción densidad de población x despanojado. La cruza simple versión androestéril en promedio rindió 8873 kg/ha, superior estadísticamente (17,9%) a la versión fértil que produjo 7521 kg/ha. La densidad de población de 80 000 plantas/ha con 9640 kg/ha, superó estadísticamente al rendimiento obtenido con 50 000 plantas/ha (7193 kg/ha). El testigo sin despanojar (9429 kg/ha) superó estadísticamente al despanojado.
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.
VIGOR DE LAS SEMILLAS Y PRODUCTIVIDAD DE VARIEDADES DE MAíZ
Margarita Tadeo-Robledo,Alejandro Espinosa-Calderón,Roberto Valdivia-Bernal,Noel Gómez-Montiel
Agronomía Mesoamericana , 2010,
Abstract: En Cuautitlán Izcalli, México (FESC-UNAM), en el ciclo primavera verano del 2004, con el objetivo de determinar el efecto de la época de cosecha en el vigor de la semilla de maíz, se evaluó la productividad de cuatro variedades de maíz amarillo de ciclo precoz, cosechadas en cinco épocas, las semillas se almacenaron hasta la primavera - verano de 2007. En dos de las variedades, se midió la germinación y vigor, así como las diferencias en el vigor por tama o de semilla (peque a y grande menor a 7 mm o mayor a 7 mm, respectivamente) en cada época de cosecha. Para cada genotipo se estimó el porcentaje de materia seca, de grano, y el rendimiento. Se empleó en el campo un dise o bloques completos al azar con tres repeticiones, para la distribución de los tratamientos, el análisis estadístico fue en forma factorial, se consideraron los factores: genotipos, épocas de cosecha, la interacción genotipos x épocas de cosecha. Los mayores rendimientos (6541 kg/ha, 7335 kg/ha y 7550 kg/ha) se obtuvieron en la cosecha efectuada a los 149, 152 y 156 días después de la siembra, cuando las variedades estaban en la madurez fisiológica. Las tres variedades de textura cristalina: Oro Ultra 1C (6477 kg/ha), Oro Ultra 2C (6242 kg/ha), Oro Ultra 3C (6210 kg/ha), fueron diferentes estadísticamente a Oro Plus 1D (4575 kg/ha), de textura dentada. No se encontraron diferencias significativas en el vigor entre variedades. La semilla grande mostró el mayor peso seco de la plántula.
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.
Despanojado y densidad de la población en una cruza simple androestéril y fértil de maíz
Espinosa-Calderón,Alejandro; Tadeo-Robledo,Margarita; Sierra-Macías,Mauro; Caballero-Hernández,Filiberto; Valdivia-Bernal,Roberto; Gómez-Montiel,Noel Orlando;
Agronomía Mesoamericana , 2010,
Abstract: de-tasseling and plant density in a single androsterile and fertile cross of maize. the objective of this work was to determine the effect of de-tasseling on the productivity of single crosses of maize. an experiment was established the spring - summer seasons of year 2004 in rancho almaraz of the faculty of superior studies in cuautitlán of the national autonomous university of mexico (fesc-unam) located at 2,240 masl in cuautitlán izcalli, mexico. a randomized complete block design was used in the field that included three repetitions. statistical analysis was carried out in as a factorial considering the factors genotype (2), population density (3) and the treatment of de-tasseling and without detasseling (2), as well as the interactions. grain yield showed highly statistical differences for de-tasseling, and significant differences for genotype and population density, and the interaction de-tasseling x population density. the single cross version male sterile produced 8,873 kg/hectare, 17.9% higher than the fertile version, which yielded 7,521 kg/h. the population density of 80,000 plants/h and yield of 9,640 kg/h was statistically higher than the yield obtained with 50 000 plants/ha (7193 kg/h). the check without de-tasseling (9,429 kg/h) was statistically superior than the de-tasseling.
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.
Vigor de las semillas y productividad de variedades de maíz
Tadeo-Robledo,Margarita; Espinosa-Calderón,Alejandro; Valdivia-Bernal,Roberto; Gómez-Montiel,Noel; Sierra-Macías,Mauro; Zamudio-González,Benjamín;
Agronomía Mesoamericana , 2010,
Abstract: seed vigor and productivity of maize varieties. in cuautitlán izcalli, mexico (fesc-unam), during the 2004 spring-summer season, in order to determine the effect of harvest time on the vigor of maize seeds, the productivity of four early-maturing, yellow-grain maize varieties, harvested at five different times and stored until spring-summer 2007 was determined. for two varieties, seed germination and vigor were measured, as well as the differences in vigor due to seed size (small and large, smaller than or larger than 7 mm, respectively) during each harvest time. the percentage of dry matter, grain ratio and yield were measured for the four genotypes. in the field, a randomized complete block design with three replications was used for treatment distribution. statistical analysis was performed as a factorial, considering the factors genotype, harvesting dates, and the interaction genotype x harvesting date. the highest yields (6541 kg/ha, 7335 kg/ha and 7550 kg/ha) were obtained at harvesting dates of 149, 152 and 156 days after planting, when the varieties had reached physiological maturity. the three maize varieties with flint grain: golden ultra 1c (6477 kg/ha), golden ultra 2c (6242 kg / ha), and golden ultra 3c (6210 kg/ ha) had better yield than the variety gold plus 1d (4575 kg/ha), with dented grain. no differences in seed vigor were detected in the varieties studied. larger seeds produced seedlings with higher dry weight.
épocas de cosecha, productividad y tama?o de semilla con relación al vigor de dos híbridos de maíz
Espinosa-Calderón, Alejandro;Tadeo-Robledo, Margarita;Tinoco-González, Luisa Elena;Martínez Mendoza, Rafael;Tellez, Cosme;González-Rojo, Isaías;Valdivia Bernal, Roberto;Caballero-Hernández, Filiberto;Sierra-Macías, Mauro;Gómez Montiel, Noel;Palafox Caballero, Artemio;Zamudio González, Benjamín;
Agricultura técnica en México , 2009,
Abstract: seedling vigor is an important trait for seed quality, particularly when sowing and soil bed preparation are not optimal. the aim of this research was to determine the effect of five harvest dates and two seed sizes on the seed vigor of two corn hybrids adapted to high valleys of mexico (2 200 to 2 600 masl), puma 1075 and puma 1076, seed from similar growth cycle and year. the research consisted of two phases, the first was carried out during the spring-summer season in 2004, in which the hybrids seed was increased and where harvest took place at five different dates. the seed was benefited and stored. in the second phase, during the spring-summer of 2006 an experiment was conducted to determine the vigor of the different seed samples produced in 2004. the experiment was conducted under a completely randomized block design and data were taken for: rate of emergency, plumule length, longitude of radicle, fresh weight of plumule, fresh weight of root, dry weight of plumule and root dry weight. there were highly significant differences (p<0.01) in the interaction between genotype and seed size for the variables fresh weight of plumule and fresh weight of root, but no for other variables. for many traits no differences were observed between genotypes, size seed, as well as their interaction, which may be due to the fact that the two hybrids, have similarities since they have a parent in common. another factor could be due to the fact that the depth of planting , soil type and moisture conditions utilized were favorable and therefore there was none adverse factor to elicit differences in seed vigor.
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.
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