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Search Results: 1 - 10 of 235505 matches for " Mario D.;Padilla-Ramírez "
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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
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.
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.
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
Coleópteros necrófilos (Scarabaeidae, Silphidae y Trogidae) de Malinalco, Estado de México, México
Trevilla-Rebollar, Antonio;Deloya, Cuauhtémoc;Padilla-Ramírez, Jorge;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000400005
Abstract: collections were made during one year, between august 2005 and july 2006, in malinalco, state of mexico, in three sites of tropical deciduous forest, a pasture and a induced forest of pine-oak, established in a altitudinal gradient ranging from 1,253 m to 2,300 m. the total of 7,680 specimens scarabaeidae, silphidae and trogidae were captured through ntp-80, representing 18 genera and 38 species. onthophagus and canthon contained 46% of the richness of scarabaeidae. the more distant sites were complementary in their species composition. the lowest complementarity occurred between sites with tropical deciduous forest. it revises the material collected through pitffal traps and light traps funnel type, increasing the list of 38 to 50 species in the study area. between 40% and 50% of the species in malinalco are distributed in localities of the province of the basin balsas and localities of the province of the sierra madre del sur, and 30% in the localities of the province of pacifica coast. for the first time 17 species of scarabaeidae and three trogidae were reported for the state of mexico.
Fenología, producción y características de fruto de selecciones de durazno (Prunus persica L. Batsch.) Ana en Aguascalientes
Gutiérrez-Acosta, F.;Padilla-Ramírez, J. S.;Reyes-Muro, L.;
Revista Chapingo. Serie horticultura , 2008,
Abstract: peach (prunus persica l. batsch) of ana cultivar were obtained from seed grown trees at the commercial orchard "san carlos" in aguascalientes state, mexico. it has high fruit production and good commercial quality. selection is a plant breeding method commonly used in fruit crops. it is based on the identification of outstanding individuals, coming from seed propagation, with a desirable trait as selection criteria. the objectives of this research were to characterize and to evaluate a group of ana type peach selections. the study was conducted from 2000 to 2004 at the commercial orchard "san carlos", in the asientos county, aguascalientes state. plant phenology, fruit yield and quality were evaluated on twenty one selected trees originated from seed. for the statistical analysis of fruit yield and fruit number, a randomized complete block design was used, while for fruit characteristics a split plot design with 10 replications was used. least significant difference was used for mean comparisons (p< 0.05). the average phenological behavior of the five years of evaluation was as follows: beginning of flowering, sprouting and harvest was from the julian day 24 to 33; 28 to 39 and from the day 221 to 227, respectively. fruit yield per plant varied from 16.1 to 41.1 kg; fruit number was from 128 to 308 fruits tree-1, fruit weight ranged from 84.19 to 177.59 g; polar and equatorial diameter were from 4.89 to 6.51 cm and 5.23 to 6.91 cm, respectively. pulp thickness was from 1.64 to 2.44; total soluble solids were from 10.53 to 12.75%. finally, polar, equatorial diameter and seed weight were: from 2.93 to 3.38 cm, 1.99 to 2.38 cm and 4.48 to 6.77g, respectively. the outstanding selections were: s-59, s-67, s-65 and s-68.
Producción de fruto e índices productivos en árboles de guayabo
Padilla-Ramírez, José Saúl;González-Gaona, Ernesto;Reyes-Muro, Luis;Mayek-Pérez, Netzahualcóyotl;
Agricultura técnica en México , 2007,
Abstract: guava (psidium guajava l.) is one of the main fruit trees cultivated in mexico, with a production area of 24 000 ha and annual production of 3 00 000 t. fresh fruit production of 24 guava selections grown in huanusco, zacatecas, mexico was recorded during 1999-2002, and then related to two productivity indexes: productivity index based on canopy volume and productivity index based on stem cross sectional area. this work was conducted in order to identify useful traits that can be used for the evaluation of productivity in landraces and breed guava germplasm in mexico. all evaluated materials were identified and selected in the calvillo-ca?ones region. fruit production ranged from 34 to 73 kg tree-1, while the average number of fruits per tree was from 551 to 1514. selections with greatest number of fruits were 11, 106, 126, 12, and 47. the most vigorous accessions were 118, 106, 115, 117, and 42. positive associations between fruit production and productivity indexes were found.
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.
Los procesos de formalización y el papel de la experiencia en la construcción del conocimiento sobre los fenómenos físicos
Mario H. Ramírez Díaz
Latin-American Journal of Physics Education , 2010,
Abstract:
Traqueostomía percutánea por dilatación: Reporte de 70 casos
Ramírez- Arce,Jorge A; Padilla- Cuadra,Juan I.; Sánchez- Arias,Mario;
Acta Médica Costarricense , 2006,
Abstract: tracheostomy is the most common surgical procedure performed in critical care patients. in the last few years, a technique known as percutaneous dilational tracheostomy guided by bronchoscopy was introduced. we present our experience with this procedure at the hospital r.a. calderón guardia, san josé costa rica. materials and method: a percutaneous tracheostomy was perform in 70 patients between august 2002 and october 2004 at the critical care unit of the hospital dr. rafael angel calderón guardia. the procedure was performed following a modification of the ciaglia technique. epidemiological data and complications were collected. results: eighty percent were men and 20 % women. the main complications were transient low oxygen saturation (7.14 %), tracheal ring fracture (4.2 %), bronchoscope puncture (4.2 %), unplanned extubation (2.85%) and mild bleeding (2.85%). average surgical time was 8.14 minutes. there was no mortality associated with the procedure. conclusion: this technique is safe and can be performed by medical intensivists. there should be a multidisciplinary team to support the performance of this procedure. percutaneous tracheostomy should be the first choice technique for tracheostomy in the critical care unit.
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