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Search Results: 1 - 10 of 361172 matches for " Efraín Acosta-Díaz "
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Efecto del riego suplementario en la producción de biomasa y grano de frijol de temporal en Zacatecas, México
Acosta-Díaz, Efraín;Acosta-Gallegos, Jorge Alberto;Amador-Ramírez, Mario Domingo;Padilla-Ramírez, José Saúl;
Agricultura técnica en México , 2009,
Abstract: in the semiarid highlands of north-central mexico, the lack of water for agricultural production is an important problem, particularly since annually a depletion of two m in the water mirror of local wells is taking place and the water storage capacity in dams is limited. because of the above situation, the optimization of water resources through supplemental irrigation in critical stages of bean sown under rainfed conditions is important. the aim of the present research was to determine the effect of supplemental irrigation on shoot biomass accumulation and seed yield in two sets of improved cultivars with different seed type. two experiments were established at cezac experiment station in zacatecas, mexico in 2001; nine black-seeded cultivars were evaluated in one trial, and 14 seed colored cultivars in a second one. all cultivars are of the type iii indeterminate growth habit. two soil moisture levels were utilized: 1) rainfall plus supplemental irrigation and 2) natural rainfall conditions. the rainfall plus supplemental irrigation treatment consisted of maintaining the available soil moisture above 50% throughout the crop-growing season, which was achieved by rainfall plus two irrigations, one at pre- and the second at the flowering stages. the natural rainfall treatment depended only on the rainfall occurred during the growing season. in both experiments, average shoot biomass accumulation and seed yield of the rainfall plus supplemental irrigation were significantly higher (p<0.01) than those in the rainfall treatment. in general, black seeded cultivars, that were significantly later to mature (p<0.05), showed higher shoot dry weight and seed yield in response to the treatment rainfed+supplemental irrigation than the colored cultivars. there was a differential response of the cultivars to the moisture treatments; outstanding black seeded cultivars were negro zacatecas, negro ontiveros and negro z524 from the mesoamerican race, while among seed colored cultiva
Efecto de la sequía en la producción de biomasa y grano de frijol Drought effect in bean biomass and grain production
Efraín Acosta-Díaz,Ismael Hernández-Torres,Raúl Rodríguez-Guerra,Jorge Alberto Acosta-Gallegos
Revista mexicana de ciencias agrícolas , 2011,
Abstract: La sequía intermitente es el factor que más limita la producción de frijol (Phaseolus vulgaris L.) bajo temporal en México. El objetivo fue determinar el efecto de la sequía sobre la acumulación de biomasa del vástago y el rendimiento de grano en variedades criollas e introducidas de frijol de temporal. Se establecieron dos experimentos, uno con 21 variedades nativas y otro con 15 variedades introducidas, de diferente hábito de crecimiento indeterminado, en la Unidad Académica La Ascensión de la Facultad de Agronomía de la Universidad Autónoma de Nuevo León, México en 2009. Los experimentos se condujeron bajo dos tratamientos de humedad del suelo: riego durante todo el ciclo y sequía. En el tratamiento de riego el suelo se mantuvo por encima de 60% de humedad aprovechable durante el ciclo del cultivo, mediante la precipitación y cuatro riegos de auxilio (dos antes y otros dos después de floración), mientras que en el tratamiento de sequía el riego se suspendió a partir del inicio de la floración. En los dos experimentos, bajo la condición de sequía la acumulación de biomasa del vástago y el rendimiento de grano fue significativamente inferior (p≤ 0.01) que en el tratamiento de riego. En general, el efecto del tratamiento de sequía sobre el peso seco del vástago fue mayor en las variedades nativas, mientras que el efecto sobre el rendimiento de grano fue mayor en las variedades introducidas. En sequía, las variedades de mayor rendimiento, fueron: nativas, Pinto-2, Pinto-1, Amarillo Mantequilla, Boleado, Bayo Blanco, Canelo y Quipincillo Rojo-1 e introducidas, Peruano, Flor de Mayo Media Oreja, Pinto-5 y Ojo de Cabra. De acuerdo con el índice de susceptibilidad a la sequía y la media geométrica, las variedades más eficientes para la producción de rendimiento de grano en ambas condiciones de humedad fueron: Pinto-2, Amarillo Mantequilla, Pinto-1, Boleado, Peruano, Flor de Mayo Media Oreja, Pinto-5 y Ojo de Cabra; sin excepción, todas estas variedades fueron colectadas en la región de prueba, lo que demuestra la importancia de la adaptación local en condiciones de sequía. Intermittent drought is most limiting factor for bean production (Phaseolus vulgaris L.) under seasonal conditions in Mexico. Aim of this work was to determine drought effect on biomass accumulation of sprout and grain yield in creole and introduced seasonal bean varieties. Two experiments were set, one with 21 native varieties and another with 15 introduced varieties, from different uncertain type growth habit, at Academic Unit La Asención from Agronomy School of Universidad Autónoma de Nu
Adaptation traits in dry bean cultivars grown under drought stress
Acosta-Díaz, Efraín;Acosta-Gallegos, Jorge Alberto;Trejo-López, Carlos;Padilla-Ramírez, José Saúl;Amador-Ramírez, Mario Domingo;
Agricultura técnica en México , 2009,
Abstract: drought is the major constraint to common bean (phaseolus vulgaris l.) production in mexico. the objective of this study was to identify physiological and phenological traits related to drought adaptation in common bean. a field experiment was conducted under a rainout shelter at the valley of mexico experimental station near texcoco, state of mexico. eight common bean cultivars from different genetic races and growth cycle and contrasted drought response were tested under drought stress and non-stress. irrigation was withheld 55 days after sowing at the initiation of flowering, to induce the stressed treatment. starting at this day, six consecutive nondestructive samplings were conducted at noon every other day. in each sampling, leaf water potential, stomata conductance and co2 assimilation rate were determined. data on phenology were also recorded. at physiological maturity, seed yield and shoot biomass were measured. harvest index was calculated. all cultivars exhibited a tendency to escape drought effects throughout accelerated reproductive development. this response was of small magnitude in mesoamerican cultivars negro cotaxtla 91 and bat 477 (type iii) and significant in cultivars from the durango race such as pinto zapata, bayo madero and bayo criollo del llano. significant difference among cultivars for stomata control was observed with high sensitivity in bat 477 and seq 12, cultivars from the mesoamerican race and in ica palmar from nueva granada race. bred and distinct cultivars ica palmar (type i) and pinto villa (type iii) from durango race, displayed high photosynthetic rate and harvest index, traits or mechanisms directly related to seed yield under stress and non-stress conditions.
Efecto de la sequía en la producción de biomasa y grano de frijol
Acosta-Díaz, Efraín;Hernández-Torres, Ismael;Rodríguez-Guerra, Raúl;Pedroza-Flores, Jesús;Amador-Ramírez, Mario D.;Padilla-Ramírez, José Saúl;
Revista mexicana de ciencias agrícolas , 2011,
Abstract: intermittent drought is most limiting factor for bean production (phaseolus vulgaris l.) under seasonal conditions in mexico. aim of this work was to determine drought effect on biomass accumulation of sprout and grain yield in creole and introduced seasonal bean varieties. two experiments were set, one with 21 native varieties and another with 15 introduced varieties, from different uncertain type growth habit, at academic unit la asención from agronomy school of universidad autónoma de nuevo león, mexico in 2009. experiments were done under two treatments of soil humidity: irrigation during whole cycle and drought. in irrigation treatment soil was kept above 60% of serviceable humidity during cultivation cycle, by precipitation and four irrigation aids (two before and other two after flowering), while in treatment of drought irrigation was suspended when flowering started. in both experiments, under drought condition biomass accumulation of sprout and grain yield was significantly lower (p≤ 0.01) than in irrigation treatment. in general, effect of drought treatment on sprout's dry weight was greater in native varieties, while effect on grain yield was greater in introduced varieties. in drought, varieties with higher yield were: native, pinto-2, pinto-1, amarillo mantequilla, boleado, bayo blanco, canelo and quipincillo rojo-1; and introduced, peruano, flor de mayo media oreja, pinto-5 and ojo de cabra. in accordance with drought susceptibility index and geometric average, most efficient varieties for production of grain yield under both humidity conditions were: pinto-2, amarillo mantequilla, pinto-1, boleado, peruano, flor de mayo media oreja, pinto-5 and ojo de cabra; without exception, all these varieties were collected in test region, which demonstrates importance of local adaptation under drought conditions.
Biomasa y rendimiento de frijol tipo flor de junio bajo riego y sequía
Acosta-Díaz, Efraín;Amador-Ramírez, Mario Domingo;Padilla-Ramírez, José Saúl;Gómez-Delgado, J. Patrocinio;Valadez-Montoya, Heladio;
Agricultura técnica en México , 2007,
Abstract: in the state of zacatecas, mexico 200 thousand ha of dry bean flor de junio class are annually sown, and its yield average is 315 kg ha-1. this low yield is due to intermittent drought during the growing season. the objective was to determine the effect of different soil moisture levels on plant maturity, shoot and root dry weight per plant, root-shoot ratio and yield of four bean genotypes. in 2002, two trials were conducted; one under greenhouse conditions and the other in the field at the unidad de agronomía of the universidad autónoma de zacatecas. in the greenhouse four soil moisture levels in 3 kg pots were evaluated; one without drought and three from moderate to severe stress: a) irrigated (r), 100% of the evapotranspired water was restituted every 12 h during the cycle, b) moderate drought (sm), 75% of the volume of r was restituted, c) severe drought (ss), 50% of the volume of r was restituted and d) moderate drought during the vegetative stage and severe drought during the reproductive stage (smv+ssr). in the field, two treatments were tested: rainfed (s), depending on rainfall and rainfed plus supplemental irrigation (s+r), with rainfall, contribution and three irrigations as needed. the stress treatments affected negatively all traits in the genotypes in comparison with r and s+r treatments in greenhouse and field, respectively. in the greenhouse; in comparison to the control (r) the average reductions observed with the smv+ssr treatment were: seven days to mature, 26% in shoot dry weight, 44% in root dry weight and 53% in yield. the negative effects increased accordingly to the drought level applied, except for root-shoot ratio, which increased with the stress. under field conditions, the average reductions under the rainfed treatment (s) as compared to (s+r) were: 13 days for maturity, 34% in shoot dry weight and 48% in yield. on the basis of yield reduction, drought susceptibility index and geometric mean of yield, lines uaz fj 2 and uaz fj 3 resulte
Evaluación de aguacates criollos en Nuevo León, México: región sur
Acosta Díaz, Efraín;Hernández Torres, Ismael;Almeyda León, Isidro Humberto;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: the state of nuevo león, mexico, is a part of the birthplace of the mexican breed of avocado (persea americana mill, var. drymifolia), where creole varieties are planted in commercial gardens and backyards, with the outstanding use of the variety plátano grueso-1 (local variety). this variety is characterized by an early cycle of physiological maturity, allowing production to concentrate into a relatively short period. the objective of this research was to characterize a group of creole varieties of avocado in the south of nuevo león, using morphological characteristics of the fruit. twenty nine varieties were used including the variety plátano grueso-1 (local variety), present in six commercial gardens and a backyard in the municipalities of aramberri and zaragoza, nuevo león. seventeen materials were identified as having morphological characteristics similar to the variety plátano grueso-1, and they were classified into three groups. the first group is formed by 12 varieties with fruit characteristics similar to those of plátano grueso-1, with a period of early physiological maturity. the second group is composed of three varieties with characteristics similar to those of plátano grueso-1, with an intermediate period of physiological maturity. the third group consists of two varieties with similar fruit characteristics to the variety plátano grueso-1, with a late period of physiological maturity. results suggest that there is a wide variation in the creoles of avocado materials grown in the southern area of the state of nuevo león, which is an alternative for the diversification of the production and to no longer depend almost exclusively on the variety plátano grueso-1.
Evaluación de aguacates criollos en Nuevo León, México: región sur Evaluation of Creole avocados in Nuevo León, Mexico: southern region
Efraín Acosta Díaz,Ismael Hernández Torres,Isidro Humberto Almeyda León
Revista mexicana de ciencias agrícolas , 2012,
Abstract: El estado de Nuevo León, México, forma parte del centro de origen de la raza mexicana de aguacate (Persea americana Mill. var. drymifolia), en donde se cultivan variedades criollas en huertos comerciales y en traspatios, predominando la utilización de la variedad Plátano Grueso-1. Esta variedad se caracteriza por presentar un ciclo temprano de madurez fisiológica, lo cual permite que su producción se concentre en un periodo relativamente corto. El objetivo de esta investigación fue caracterizar un grupo de variedades criollas de aguacate en la región sur del estado de Nuevo León, mediante caracteres morfológicos de los frutos. Se utilizaron 29 variedades incluyendo la variedad Plátano Grueso-1 (testigo local), presentes en seis huertas comerciales y un traspatio en los municipios de Aramberri y Zaragoza, Nuevo León. Se determinaron 17 materiales con características morfológicas similares que la variedad Plátano Grueso-1, los cuales se clasificaron en tres grupos. El primer grupo está formado por 12 variedades con características del fruto similares a la variedad Plátano Grueso-1, con un período temprano de madurez fisiológica. El segundo grupo está integrado por tres variedades con características del fruto similares a la variedad Plátano Grueso-1, con un período intermedio de madurez fisiológica. El tercer grupo está constituido por dos variedades con características del fruto diferentes a la variedad Plátano Grueso, con un periodo tardío de madurez fisiológica. Los resultados obtenidos sugieren que existe una amplia variación en los materiales criollos de aguacate cultivados en la región sur del estado de Nuevo León, lo cual se constituye como una alternativa para diversificar la producción y no depender casi exclusivamente de la variedad Plátano Grueso-1. The State of Nuevo León, Mexico, is a part of the birthplace of the Mexican breed of avocado (Persea americana Mill, var. drymifolia), where Creole varieties are planted in commercial gardens and backyards, with the outstanding use of the variety Plátano Grueso-1 (local variety). This variety is characterized by an early cycle of physiological maturity, allowing production to concentrate into a relatively short period. The objective of this research was to characterize a group of Creole varieties of avocado in the south of Nuevo León, using morphological characteristics of the fruit. Twenty nine varieties were used including the variety Plátano Grueso-1 (local variety), present in six commercial gardens and a backyard in the municipalities of Aramberri and Zaragoza, Nuevo León. Seventeen materials w
Relación entre índice de área foliar y rendimiento en frijol bajo condiciones de secano
Acosta Díaz, Efraín;Acosta Gallegos, Jorge Alberto;Amador Ramírez, Mario Domingo;Padilla Ramírez, José Saúl;
Agricultura técnica en México , 2008,
Abstract: the leaves of the bean plant are one of the organs more affected by intermittent drought stress. the objective of this research was to determine the relationship between the leaf area index and seed yield at four phenological stages in dry bean cultivars of different grain type grown under rainfed conditions. the study was conducted in the main three producing areas in the state of zacatecas, mexico, during the summer of 2002 at six locations: four in the northwestern area, sown with a cv. negro san luis type; one in the central region, with a cv. of the flor de junio type and one in the southeastern region, with a cv. of the flor de mayo type. in each location, eight fields were chosen and in each two rows of 5 m longitude with four replications. four leaf area index samplings were made at four phenological stages: at the beginning of flowering, beginning of pod formation, beginning seed filling, and intermediate seed filling. seed yield was determined at physiological maturity. the relationship between the leaf area index at different stages and seed yield was determined by simple correlations. in general, average leaf area index increased with the development of the phenological stages, the highest values were observed at the beginning of the seed filling stage. average seed yield varied among locations: 130 g m-2 at the northwestern region with cv. negro san luis type, 139 g m-2 at central with cv. flor de junio type and 95 g m-2 at southwestern with cv. flor de mayo type.
Geospatial Model as Strategy to Prevent Forest Fires: A Case Study  [PDF]
Marín Pompa-García, Maico Zapata-Molina, Ciro Hernández-Díaz, Efraín Rodríguez-Téllez
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.39120
Abstract: The forests of the State of Durango have been severely affected by fires in recent years. Early detection of fires through watchtowers is essential. In this work a geospatial model was generated to optimize strategic visualization points, using a GIS environment. Analysis of the area of visibility was developed by integrating a digital model of elevation and a plant cover map. The resulting distribution generates more than 50% coverage of the studied area, in points that were not always the highest. It was concluded that this strategy would permit to increase the efficiency, mainly favoring the communities of pine, whose economic importance would justify the required investment.
Frecuencia y factores de riesgo de la diabetes mellitus postrasplante renal
Borroto Díaz,Gerardo; Batista Barbán,Francisco; Barceló Acosta,Malicela; Guerrero Díaz,Carlos;
Revista Cubana de Medicina , 2002,
Abstract: a study of 274 patients with kidney transplants from "hermanos ameijeiras" clinical and surgical hospital was conducted. post-transplant diabetes was diagnosed when there were 3 determinations of glycemia during fasting over 7.8 mmol/l. it was found a frequency of post-transplant diabetes mellitus of 12.78 % (39/274) and the probability of acquiring it increased with the time. the male sex, the oldest patient, the kidney damage produced by polycystic kidneys and glumerolopathies, hyperglycemia on the ti (first day of transplant), obesity and the use of high doses of steroids and cyclosporin-a (csa) were more frequently observed in the group with ptdm and were statistically significant on comparing them with the control group.
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