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Search Results: 1 - 10 of 198948 matches for " Fabián Robles "
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Effect of Solid Wastes Composition and Confinement Time on Methane Production in a Dump  [PDF]
Carlos González, Otoniel Buenrostro, Liliana Marquez, Consuelo Hernández, Edgar Moreno, Fabián Robles
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.210151
Abstract: In developing countries, illegal dump structures or even some landfills do not include methane collecting systems, even if local environmental laws exist. In this condition, the greenhouse gas escapes to the atmosphere uncontrolled and practical solutions to tackle this problem are not obvious. To make a solution approachable, first-hand reliable data from dump emissions are required as starting point. The methane production is not homogeneous throughout the dump, therefore to estimate its global methane emissions, various representative gas monitoring sites distributed along the dump becomes necessary. This research work presents the measures of biogas emissions collected in the final disposal site located at Morelia (Mexico), along with an evaluation of the organic fraction and confinement time participation on biogas production. Biogas emission data were taken with a portable analyzer from 49 ventilation pipes for 52 weeks. For the composition and degradability analysis of solid wastes, the required samples have been collected from 16 sites. The results show a heterogeneous composition of solid wastes: 38 separate components are present, from those, 19 belong to organic categories and 28 of total components accounts for almost 99% of the waste. The mean biogas concentration detected was: 45.5% CH4, 32.4% CO2, 3.1% O2, and 18.9% balance gas (i.e., N2, CO or H2S). The ANOVA procedure clearly corroborated the influence of composition, biodegradability and time of confinement of solid wastes on the production of methane, despite the deficiencies in the final soil layer cover in these sites.
Effects of Trinexapac-Ethyl on different wheat varieties under desert conditions of Mexico  [PDF]
Raúl Leonel Grijalva-Contreras, Rubén Macías-Duarte, Gerardo Martínez-Díaz, Fabián Robles-Contreras, Fidel Nu?ez-Ramírez
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.35079
Abstract: A field study was conducted to determine the effect of Trinexapac-Ethyl (TE) on four wheat varieties (Rafi C97, Altar C84, Nacori C97 and Rayon F86) at three growth stages (first node, second node and flag leaf). TE application (150 g a.i. ha-1) reduced plant height and decreased grain yield at any growth stage. Yield decrease was associated to a significant reduction in the number of grains per spike and in grain weight. TE delayed flowering time and grain maturity, while stem diameter and spikes m-2 were not affected. Further studies are needed to clarify the effect of TE on wheat under desert conditions of Mexico.
Productividad del chabacano en el noroeste de México
Grijalva Contreras, Raúl Leonel;Macías Duarte, Rubén;Robles Contreras, Fabián;
Agricultura técnica en México , 2006,
Abstract: in mexico the production of apricot (prunus armeniacae) is extremely low. during 2002 the harvested area was 410 ha with a production of 1 900 t, contrasting with the demand that exists in the national market and open possibilities for exportation. the objectives of this study were to evaluate the adaptation of different selections of apricot of low chilling requirement and to select those of high yield potential and fruit quality, and to determine the effect of hydrogen cyanamide application on budbreak, fruit maturation and yield. the experiment was carried out at the experimental station region of caborca, of the national research institute for forestry, agriculture, and livestock (inifap), mexico during 1990 to 2002. the experiment consisted of the evaluation of 18 apricot lines of low-chilling requirement developed at the university of florida, usa. the trees were planted in march 1990 at a distance of 5x5 m. the rootstock used was the peach cv. nemaguard. also, during 2001 and 2002 three concentrations of hydrogen cyanamide: 0.0, 0.75 y 1.5% were tested. the lines with high yield during six years of evaluation (1997-2002) were: 7-23, 16-1,1-81, 11-2, 15-1 and #3 with an average yield of 24.6, 22.7, 21.7, 16.3, 15.0 and 14.8 t ha-1, respectively. the cultivar 'canino' (commercially grown cv. in the northwest of mexico) produced 14.2 t ha-1. in addition to excellent yield, these lines possessed good fruit quality and appropriate fruit maturation time and did not exhibit any serious disease problems. the application of hydrogen cyanamide improved budbreak and yield and also accelerated the maturation time between 4 and 5 days. these findings could contribute to widen the fruit market window.
Comportamiento de híbridos de tomate bola en invernadero bajo condiciones desérticas del noroeste de Sonora
Grijalva Contreras, Raúl Leonel;Macías Duarte, Rubén;Robles Contreras, Fabián;
Tropical and subtropical agroecosystems , 2011,
Abstract: the objective of this research was to evaluate the potential yield and fruit quality of 10 beef tomatoes hybrids using a low level technology greenhouse and desertic conditions of northwest of sonora. this experiment was done during two years 2005 and 2006 at the experimental station of caborca, inifap. the yield reached during both years was of 25.2 kg m-2 but 89.1% of this production was harvested during february to may. the tomatoes hybrids with higher yield were zuni, gironda and charleston with 31.1, 28.2 and 26.7 kg m-2, respectively; while thomas, rapsodie, sedona and beatrice were the lowest yield with 20.1, 22.4, 23.1 and 24.9 kg m-2, respectively. by other side, the hybrids with better fruit weight in both years were sedona and charleston with 211.3 and 209.8 and 194.7 grams fruit-1. also, there were differences among tomatoes hybrids on physiological disorders susceptibility (fruit cracking and blossom end rot). for this reason, adequate selection of the tomatoes hybrid is a good alternative for increase yield and fruit quality and reduction of physiological disorders.
SECADO DE RESIDUOS DE JARDINERíA EN REACTORES MEDIANTE PROCESOS BIOLóGICOS
Francisco J. COLOMER MENDOZA,Lidón HERRERA PRATS,Fabián ROBLES MARTíNEZ,Antonio GALLARDO IZQUIERDO
Revista internacional de contaminación ambiental , 2012,
Abstract: El biosecado consiste en disminuir la humedad y estabilizar la materia biodegradable para obtener un producto útil como combustible o como paso previo a su depósito en vertedero. Para ello, se aprovecha el calor de la fermentación aerobia de la materia biodegradable. Los parámetros que controlan el proceso son: aireación, temperatura alcanzada y humedad inicial. En este trabajo, se han empleado como sustrato los residuos de jardinería de la Universidad Jaume I de Castellón. El biosecado se realizó en reactores de 25 litros de capacidad en los que se aprovechó el calor generado en la fermentación. La trituración de los residuos y la aireación de estos mejoraron el proceso de biosecado. Los tiempos de secado fueron de 20 días, reducciones de volumen entre el 45.5 y el 63.2 % y de peso del 39.9-57.2 %. El residuo final redujo su humedad hasta un 41.4 % y alcanzó un poder calorífico final (2000 kcal/kg) adecuado para ser usado como combustible.
Biodrying under Greenhouse Conditions as Pretreatment for Horticultural Waste  [PDF]
Fabián Robles-Martínez, Elizabeth M. Silva-Rodríguez, Teodoro Espinosa-Solares, Belem Pi?a-Guzmán, Carmen Calixto-Mosqueda, Francisco J. Colomer-Mendoza, Enrique Durán-Páramo
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.34038
Abstract: The biodrying process was studied as an alternative technology to reduce the mass and volume of horticultural waste. Four static piles were prepared inside a greenhouse: two containing whole waste and two consisting of shredded waste. All the piles were compared with a test pile containing whole waste and placed outside the greenhouse. In two cases, ventilation ducts were installed to improve aeration. Each greenhouse was 2.0 m wide, 3.5 m long and 1.16 m high. The air temperature and relative humidity were monitored both inside and outside the greenhouse. Mass, humidity, organic matter and total nitrogen in the waste were measured. Piles inside the greenhouse showed decreases of 80% and 75% in weight and volume, respectively, during the first 16 days. The data obtained in this work suggest that biodrying could improve the handling and transport of horticultural waste while also minimizing the impact of pollutants.
Effect of Regulated Deficit Irrigation on Productivity, Quality and Water Use in Olive cv “Manzanilla”  [PDF]
Raúl Leonel Grijalva-Contreras, Rubén Macías-Duarte, Gerardo Martínez-Díaz, Fabián Robles-Contreras, Manuel de Jesús Valenzuela-Ruiz, Fidel Nu?ez-Ramírez
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412A3013
Abstract:

The objective of this experiment was to determine the effect of different regulated deficit irrigation (RDI) strategies on productivity, oil quality and water-use efficiency on olive grown in the Sonoran Desert. The experiments were carried out in 2009 and 2010, and in a ten years old traditional (10 × 5 m) “Manzanilla” olive orchard. The control treatment was irrigated at 100% ETc during the whole season while RDI treatments were applied at 75% ETc or 50% ETc. The two RDI were applied during two phenological stages: at postharvest to evaluate the effect on table olive or from pit hardening to harvest to evaluate the effect on oil olive. Our results indicated that RDI applying 50% ETc during postharvest period reduced significantly fruit set and table olive yield, while applied during pit hardening to harvest period, it decreased oil yield but increased oil content. The RDI applying an ETc of 75% during the postharvest period gave similar table olive yield to the control, and applied form of pit hardening to harvest also gave similar oil yield to the control. The RDI using an ETc of 75% resulted in the highest water-use efficiency for oil or table olive production.

Effect of Ethephon on Almond Bloom Delay, Yield, and Nut Quality under Warm Climate Conditions in Northwestern Mexico
Grijalva-Contreras,Raúl Leonel; Martínez-Díaz,Gerardo; Macías-Duarte,Rubén; Robles-Contreras,Fabián;
Chilean journal of agricultural research , 2011, DOI: 10.4067/S0718-58392011000100004
Abstract: world almond (prunus dulcis (mill.) d.a. webb) production is mostly located in areas where flowering is injured by low temperatures, and using ethephon (2-chloroethylphosphonic acid) to delay bloom is suggested as a measure to avoid frost damage. however, it is unknown if that practice could be beneficial in mexico?s warm climates. the objective of this study was to determine the effect of ethephon on almond bloom delay and yield. we evaluated foliar applications of ethephon at doses of 75, 150, and 300 mg l-1 at 10% leaf drop stage and at 150 mg l-1 during dormancy over 2 yr. in 2004, ethephon applied at 10% leaf drop stage delayed bloom by 7, 8, and 9 d at 75, 150, and 300 mg l-1, respectively (p < 0.01), and in 2005, bloom delay was 3 d at 300 mg l-1. ethephon applied during dormancy delayed bloom 2 d in the first year, but showed no effect in the second year. yield and fruit set were affected by ethephon applied at 10% leaf drop stage only in 2004. neither yield nor fruit set were affected by ethephon applied during dormancy in both years. pistil length, nut quality, harvest date, and gum exudation were not affected by ethephon. in accordance with the results, ethephon should not be recommended to delay bloom in almond orchards growing in mexico?s warm climates.
Ensamblajes de peces arrecifales y su relación con el hábitat bentónico de la Isla Isabel, Nayarit, México
Galván-Villa,Cristian M; Arreola-Robles,José L; Ríos-Jara,Eduardo; Rodríguez-Zaragoza,Fabián A;
Revista de biología marina y oceanografía , 2010, DOI: 10.4067/S0718-19572010000200013
Abstract: this study describes the reef fish assemblages of isabel island and their relation with the benthos heterogeneity. a total of 39 visual transects from 19 different localities were performed in the zones north, south, east, and west around the island during december 2002, october 2004, and april 2005. the species composition and their abundance were registered in each transect. video-transects were also performed to estimate the cover of benthic morpho-functional groups. a total of 9,956 specimens of fishes belonging to 118 species, 85 genera, and 51 families were registered. the 58.3% of the species have biogeographic affinity to the panamic province. six endemic species of the mexican pacific were registered, including two species endemic to the gulf of california. according to the biological value index seven species were dominant in the island: thalassoma lucasanum, prionurus punctatus, stegastes flavilatus, halichoeres dispilus, acanthurus xanthopterus, abudefduf troschelii, and johnrandallia nigrirostris. the indexes of diversity and evenness were not significantly different between the four zones of the island. however, there was a relation between the zones with higher biodiversity (south and east) and some components of the benthic habitat. the principal component analysis found that the cover of corals and rocks are highly related with the dominant species of the island, while the zones with highest proportion of sand, sponges, and gorgonians have less influence on fish diversity
Effect of Ethephon on Almond Bloom Delay, Yield, and Nut Quality under Warm Climate Conditions in Northwestern Mexico Efecto del Ethephon en el Retraso de la Floración, la Producción y la Calidad del Almendro, bajo Condiciones de Clima Caliente del Noroeste de México
Raúl Leonel Grijalva-Contreras,Gerardo Martínez-Díaz,Rubén Macías-Duarte,Fabián Robles-Contreras
Chilean Journal of Agricultural Research , 2011,
Abstract: World almond (Prunus dulcis (Mill.) D.A. Webb) production is mostly located in areas where flowering is injured by low temperatures, and using ethephon (2-chloroethylphosphonic acid) to delay bloom is suggested as a measure to avoid frost damage. However, it is unknown if that practice could be beneficial in Mexico’s warm climates. The objective of this study was to determine the effect of ethephon on almond bloom delay and yield. We evaluated foliar applications of ethephon at doses of 75, 150, and 300 mg L-1 at 10% leaf drop stage and at 150 mg L-1 during dormancy over 2 yr. In 2004, ethephon applied at 10% leaf drop stage delayed bloom by 7, 8, and 9 d at 75, 150, and 300 mg L-1, respectively (p < 0.01), and in 2005, bloom delay was 3 d at 300 mg L-1. Ethephon applied during dormancy delayed bloom 2 d in the first year, but showed no effect in the second year. Yield and fruit set were affected by ethephon applied at 10% leaf drop stage only in 2004. Neither yield nor fruit set were affected by ethephon applied during dormancy in both years. Pistil length, nut quality, harvest date, and gum exudation were not affected by ethephon. In accordance with the results, ethephon should not be recommended to delay bloom in almond orchards growing in Mexico’s warm climates. La producción de almendra (Prunus dulcis (Mill.) D.A. Webb) en el mundo está situada sobre todo en las áreas donde la floración es da ada por bajas temperaturas, y se sugiere el uso del ethephon (ácido 2-cloroetil fosfónico) para retrasarla, como una medida para evitar da os por helada. Sin embargo, no se sabe si esa práctica podría ser beneficiosa bajo los climas calientes de México. El objetivo de este estudio fue determinar el efecto del ethephon (ácido 2-cloroetil fosfónico) sobre el retraso de la floración y la producción de la almendra. Evaluamos la aplicación foliar de ethephon en dosis de 75; 150 y 300 mg L-1 en la etapa de 10% de caída de la hoja, y en 150 mg L-1 en la etapa de dormancia, durante 2 a os. En el 2004, ethephon aplicado en la etapa de 10% de caída de la hoja retrasó la floración por 7; 8 y 9 d a 75; 150 y 300 mg L-1 respectivamente (p < 0,01), y en 2005 el retraso de la floración fue de 3 d a 300 mg L-1. El ethephon aplicado durante dormancia retrasó la floración 2 d en el primer a o pero no hubo efecto en el segundo a o. El rendimiento y el amarre de fruta fueron afectados por el ethephon aplicado en la etapa de 10% de caída de la hoja en 2004, pero no en 2005. Ni la producción ni el amarre de fruta fue afectada en ambos a os por el ethephon aplicado durante dormancia
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