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Search Results: 1 - 10 of 38661 matches for " Luis Enrique Escalante-Estrada "
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La fertilización nitrogenada en el rendimiento del girasol en México
Luis Enrique Escalante-Estrada,Yolanda Isabel Escalante-Estrada,Carmen Linzaga-Elizalde
Agronomía Costarricense , 2007,
Abstract: Con el fin de evaluar el efecto de la fertilización nitrogenada aplicada al suelo sobre el rendimiento del girasol, se realizó la presente investigación en el campo del CEP-CSAEGRO. Se utilizó la línea 58 de girasol. Los niveles de N evaluados fueron: 0, 40, 80 y 120 kg ha-1, aplicados a los 9 días después de la siembra, con sulfato de amonio (20,5% N). El análisis de varianza indicó que el N aplicado aumentó el rendimiento en semilla, el diámetro del capítulo, el peso del capítulo sin semilla, el peso de 100 semillas, la altura de la planta, la eficiencia del N, y la rentabilidad económica, ya que se presentaron diferencias estadísticas significativas entre sus medias. Los valores más altos de las variables se obtuvieron cuando se aplicó 120 kg de N ha-1.
Densidad de siembra del girasol forrajero
Luis Enrique Escalante-Estrada,Yolanda Isabel Escalante-Estrada,Carmen Linzaga-Elizalde
Agronomía Costarricense , 2008,
Abstract: Con el objetivo de promover el girasol como un cultivo forrajero, se evaluó el efecto de 4 densidades de siembra (75.000, 100.000, 125.000 y 150.000 plantas.ha-1) en el rendimiento de forraje para consumo de ganado. Las evaluaciones fueron realizadas al inicio de la floración. Se utilizó un dise o de bloques completos al azar. El análisis de varianza mostró que la densidad de siembra modifica significativamente (p≤0,05) el rendimiento del girasol. Con 75.000 plantas. ha-1 se obtuvo los valores más altos, por planta, en diámetro del tallo (1,2 cm), peso seco de la hoja (30,3 g), peso seco del tallo (50,7 g), y peso seco total de la planta (98,4 g), también la relación hoja: tallo siempre fue >0,7. Con la densidad de 150.000 plantas.ha-1 se logró los valores más altos, por hectárea, en altura de la planta (102,3 cm), peso seco de la hoja (3,3 t.ha-1), peso seco del tallo (4,8 t.ha-1), y peso seco total de la planta (9,5 t.ha-1). Así, la densidad de siembra más alta afectó negativamente la biomasa por planta, pero positivamente la biomasa por hectárea
Edad al trasplante y su efecto en el crecimiento y rendimiento de chile apaxtleco
Vázquez-Casarrubias, Gabino;Escalante-Estrada, José Alberto S.;Rodríguez-González, Ma. Teresa;Ramírez-Ayala, Carlos;Escalante-Estrada, Luis Enrique;
Revista Chapingo. Serie horticultura , 2011,
Abstract: transplanting in intensive horticultural systems, such as chili, has permitted better planning of crops with preformed structures and growth uniformity, efficient use of seed, and early production. the objective of this study was to determine the effect of plantlet age at transplant on phenology, growth and yield of apaxtleco chili (capsicum annuum l.) from apaxtla, guerrero, mexico, grown in a greenhouse. treatments were three ages at transplant: 15, 30 and 45 days after emergence (t1, t2 and t3, respectively) distributed in a randomized block design with eight replications. plant density was 26 plants·m-2. the results indicate that with t3 a larger number of fruits, leaf area and plant height were obtained. in biomass, plants in t1 accumulated more in the stem (57 %), followed by leaves and fruit (29 and 14 %, respectively). with t3, more biomass was accumulated in the fruit, and consequently, yield was higher (44.3 g·plant-1) 1.15 kg·m-2.
Growth and Allocation of Dry Matter in Bean Seedlings Developed up to the Senescence of the Cotyledons
Agriculturae Conspectus Scientificus (ACS) , 2008,
Abstract: The allocation of dry matter in seedling of the common bean (Phaseolus vulgaris L.) depends on the nutrient content in the cotyledons on principle of germination. The importance of these structures for the growth of the seedling ranges from the time of germination to the emergence of the seedling and the time when the simple leaves can realize photosynthesis. The objective of this research was to study and quantify the distribution of dry matter from the stage of germination until senescence of cotyledons during the seedling stage. Two experiments were conducted using the common bean variety Cacahuate-72, one in a greenhouse and another in growth chamber with a constant temperature of 25oC. To determine the dry weight of the structures sampling was carried out at different ages of the seedling. The stem accumulated more dry matter than the root, 56% and 44% respectively. The distribution of dry matter in the shoot structures was in the following order: simple leaves 60%, hypocotyl 25%, epicotyle 8%, petioles 5% and fi rst trifoliate leaf 2%. Root dry matter was distributed in the following order: secondary roots 46%, adventitious roots 42%, taproot 10% and tertiary roots 2%. The cotyledons exhausted its reserves of nutrients by the 18th day and they senesced at the same time. At the time of senescence of the cotyledons the hypocotyl structure was longer than the stem. Considering the root, secondary roots presented more length and were the most abundant in number. The input of fertilizer to the soil is necessary when cotyledons are beginning the process of senescence.
Producción de frijol ejotero en función del tipo de espaldera
Díaz-López, Ernesto;Escalante-Estrada, José Alberto Salvador;Rodríguez-González, María Teresa;Gaytán-Acu?a, Araceli;
Revista Chapingo. Serie horticultura , 2010,
Abstract: in order to know the effect of trellis type on the production of snap bean, were sowing in montecillo mexico, the variety of hav-14, of snap bean and the cv. victoria of sunflower, plants at densities of 6.2 plants·m2, for unicultivos and 12.4 plants·m2 for the combination sunflower-snap bean. where sunflowers served how trellise for snap bean and to snap bean in unicultivos the trellises was of wood whith a fertilizer of 100-100-00 npk. the treatments was: snap beans in unicultivo (fu), snap bean with sunflower whitout cut (fgs), snap bean with sunflower cutting (fgc) and sunflower unicultivo (gu). variables evaluated were: yield, harvest index, length of snap bean, index leaf area, leaf area. the results indicate that production of snap bean in unicultivo, super to agrosistem snap bean combined with sunflower whitout cut and cut to index leaf area, leaf area.
Biomasa y rendimiento de frijol con potencial ejotero en unicultivo y asociado con girasol
Gardu?o-González, J.;Morales-Rosales, E. J.;Guadarrama-Valentín, S.;Escalante-Estrada, J. A.;
Revista Chapingo. Serie horticultura , 2009,
Abstract: the aim of this study was the estimation of biomass production, yield and yield components of two cultivars ('acerado' and 'criollo') of common bean (phaseolus vulgaris l.) with high potential for the snap bean production, monocropped and intercropped with two cultivars of sunflower (helianthus annuus l.) ('sunbright' and 'victoria'). the study was done during the spring of 2006 under rainfed conditions in tenancingo, mexico. the variables evaluated were leaf area index (lai), net assimilation rate (nar), total biomass (tb), pod diameter (pd), pod length (pl), number of pods·m-2 (np) and pod yield·m-2 (py), which were analyzed in a randomized complete block factorial arrangement. in order to consider the degree of association between the studied variables and pod yield, an analysis of simple linear correlation was made. in cultivar factor, statistical differences were detected in nar and pd; for the sowing systems factor there were significant differences in tb, pd, np and py. the interaction of cultivars * sowing system was significant in all the variables, except in nar. the associations 'criollo' + 'sunbright', 'acerado' + 'victoria', and monocropped 'acerado' had the highest py. the variables lai, tb and np were correlated positively and significantly with the pod yield. the results indicate that 'criollo' and 'acerado', associated with 'sunbright' and 'victoria', respectively, respond positively to the association, constituting a favorable option for the producers of the region of tenancingo, mexico.
Tecnología de producción de haba y características socioeconómicas de productores en Puebla y Tlaxcala
Rojas-Tiempo, Javier;Díaz-Ruiz, Ramón;álvarez-Gaxiola, Felipe;Ocampo-Mendoza, Juventino;Escalante-Estrada, Alberto;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: the research objective was to determine the technology applied to the broad bean crop for grain production in different communities of puebla and tlaxcala, mexico, in order to find weak practices and key socioeconomic characteristics; as well as desirable traits by the producers of a variety of bean. the work was developed in the broad bean-producing region in mexico. 100 questionnaires were applied, 20 per community and a semi-structured interviews with key informants plus information for farmers, through direct observation. peasant farmers with traditional features in the use of broad bean production technology based on traditional tools and the use of animals for work for preparing the ground are predominant. the source of the seeds for planting is the local varieties that they plant each year. among the socioeconomic characteristics stand out that, 4% is female and the average age is 49 years old. the broad bean-producing region has a mix of producers, with varying degrees of peasantness alternated with commercial producers or in transition to be. the desired traits of interest for its varieties are seed size medium or large, abundant flowers, pods and seeds, which are early, and resistant to major pests, diseases and drought.
Jesús R. Torres-García,J. A. Escalante-Estrada,M. T. Rodríguez-González,C. Ramírez-Ayala
Journal of Stress Physiology & Biochemistry , 2009,
Abstract: Salinity and moisture limiting crop productivity due an imbalance between concentrations of auxins, gibberellins, cytokinin, ABA and ethylene. applications of growth regulators to alleviate salinity stress can be an economic and safe alternative to environment. The objective of this study was to determine the effect of salinity (0, 1000 and 2000 ppm of NaCl), soil moisture (30 and 60%) and exogenous application of growth regulators (control, 5 mL L-1 at the Beginning of flowering and 5 mL L-1 in vegetative stage + Beginning of flowering) and the combinations of three factors in snap bean (Phaseolus vulgaris L.). Concentrations of 2000 ppm reduced biomass and pod production in 35.5 and 45%, respectively. The humidity had no effects in biomass production and pod number. With the application of growth regulators in the vegetative stage + beginning of flowering, the weight and number of pods were increased. The greater biomass and yield was observed with 0 ppm, 60% humidity and application of growth regulators in the beginning of flowering. However, with: 1000 ppm, 30% of humidity and application in B. flowering, the biomass production was statistically similar. Our conclusion suggests that the application of growth regulators can be economical and easily applicable for farmers.
Comportamiento de los estudiantes en función a sus hábitos de estudio
Escalante Estrada, Luis Enrique,Escalante Estrada, Yolanda Isabel,Lizanga Elizalde, Carmen,Merlos Escobedo, María Eugenia
Revista Electrónica Actualidades Investigativas en Educación , 2008,
Abstract: Resumen: Cuando se estudia por horas y no se percibe el rendimiento de ese esfuerzo, se olvida lo que se aprende, se prepara bien para realizar un examen y a la hora de presentarlo, se comprueba que no es así. En muchas ocasiones ocurre esta situación porque no se sabe cómo estudiar, no se tienen buenos hábitos de estudio o no se aplican las técnicas adecuadas. En esta investigación, se evaluaron los hábitos de estudio de los estudiantes de la carrera de Ingeniero Agrónomo Zootecnista del Centro de Estudios Profesionales del Colegio Superior Agropecuario del Estado de Guerrero, México. Los valores de los hábitos de estudio se obtuvieron del promedio de la suma de sus cuatro variables que son: estrategias de higiene, condición de materiales, estrategias de estudio y capacidad de estudio. Los resultados de los hábitos de estudio y de sus variables, fueron evaluados con valores de cero a diez, teniendo que valores menores de seis se consideraron reprobatorios. Los hábitos de estudio de los estudiantes, tuvieron valores mínimos aprobatorios que fueron de 6.15 a 6.95. La variable estrategias de higiene tuvo el menor valor (6.40), mientras que la variable estrategias de estudio fue el mayor valor (6.79). Las variables condición de materiales y capacidad de estudio tuvieron valores de 6.72 y 6.67 respectivamente. El aprendizaje del estudiante depende de su capacidad intelectual, de su estado emocional y de sus hábitos de estudio.Abstract: When one studies per hours and the yield of that effort is not perceived, it forgets what it is learned, thinks that it is arrived well prepared at an examination and at the time of presenting/displaying it, it is verified that is not thus. In many occasions it happens this situation because it is not known like studying, does not have good habits of study or it is not known to make use of the suitable techniques. In this investigation the habits of study of the students of the Race of Engineer Zootecnista Agronomo of Centro de Estudios Profesionales of Colegio Superior Agropecuario del Estado de Guerrero, Mexico were evaluated. The values of the study habits were obtained from the average of the sum of their four variables that are: strategies of hygiene, condition of materials, strategies of study and capacity of study. The results of the habits of study and its variables were evaluated with values from zero to ten, having smaller values of six considered reprobated. The habits of study of the students had approving minimum values that went from 6.15 to 6.95. Variable strategies of hygiene had the smaller value (6.40), wher
Compound Hidden Markov Model for Activity Labelling  [PDF]
Jose Israel Figueroa-Angulo, Jesus Savage, Ernesto Bribiesca, Boris Escalante, Luis Enrique Sucar
International Journal of Intelligence Science (IJIS) , 2015, DOI: 10.4236/ijis.2015.55016
Abstract: This research presents a novel way of labelling human activities from the skeleton output computed from RGB-D data from vision-based motion capture systems. The activities are labelled by means of a Compound Hidden Markov Model. The linkage of several Linear Hidden Markov Models to common states, makes a Compound Hidden Markov Model. Each separate Linear Hidden Markov Model has motion information of a human activity. The sequence of most likely states, from a sequence of observations, indicates which activities are performed by a person in an interval of time. The purpose of this research is to provide a service robot with the capability of human activity awareness, which can be used for action planning with implicit and indirect Human-Robot Interaction. The proposed Compound Hidden Markov Model, made of Linear Hidden Markov Models per activity, labels activities from unknown subjects with an average accuracy of 59.37%, which is higher than the average labelling accuracy for activities of unknown subjects of an Ergodic Hidden Markov Model (6.25%), and a Compound Hidden Markov Model with activities modelled by a single state (18.75%).
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