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Search Results: 1 - 10 of 605829 matches for " María Claudia; López-Casta?eda "
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Rendimiento y calidad de la semilla de cebada y trigo en campo e invernadero
Castaeda-Saucedo,María Claudia; López-Castaeda,Cándido; Colinas-De León,María Teresa B; Molina Moreno,Juan C; Hernández-Livera,Adrián;
Interciencia , 2009,
Abstract: two experiments were carried out under field conditions; one was conducted in winter-spring (fews) growing season under irrigation and another experiment was conducted under rainfall conditions in the summer (fes), while a third experiment was carried out in green house conditions in the summer (ges), in order to study the environmental effects in grain yield (gy) and seed quality between barley and bread wheat. in the combined analysis of the experiments carried out under field conditions, the results showed that the barley had 21, 31, 28 y 22% higher grain yield (gy), above-ground dry matter (agdm), number of spikes/m2, number of grains/m2 (ngpsm), respectively, with respect to wheat. barley plantlets were 6cm higher and reached its larger yield 18 days before those of wheat, although wheat showed an 11% larger harvest index (hi) than barley. gy, hi, agdm, ngpsm and plant height all decrease in fes for barley in 30, 29, 2, 12% and 25cm, respectively, and for wheat in 38, 10, 32, 27% and 32cm, respectively, compare with fews. the number of days to anthesis was 28 days and 46 days before in fes than in fews, respectively, in barley and wheat. also, in ges barley was better than the wheat on gy and agdm in 17 and 33%, respectively. barley showed a better seed quality than wheat in plantlet vigor, whereas wheat plantlets showed 10 and 23% larger germination and volumetric weight, respectively.
Variación en rendimiento de grano, biomasa y número de granos en cebada bajo tres condiciones de humedad del suelo
López-Castaeda, Cándido;
Tropical and subtropical agroecosystems , 2011,
Abstract: variability in grain yield (gy), aerial biomass (bm) and number of grains m-2 (g m-2) in f6 lines and commercial varieties of barley was studied, and the relationship among these characters in full-irrigation (fi), drought (d) and rain-fed (rf) conditions was determined. variation in gy, bm and g m-2 among all genotypes, between f6 lines and varieties, and among genotypes of f6 lines and varieties was significant in all the three soil moisture environments. gy, bm and g m-2 in fi were 23, 14 and 21 % greater than the average of the three soil moisture environments; gy, bm and g m"2 in rf were 21, 16 y 24 % lower than this average. f6 lines produced greater gy (380 g m-2), bm (1027 g m-2) and g m-2 (8641) than the commercial varieties (gy=277 g m-2; bm=696 g m-2 y g m-2=7214) in average of the three environments. gy was positive and significantly associated with bm and g m-2; bm and g m-2 were also associated. gy could be improved in either fi, d or rf environments by selecting genotypes with a greater bm and g m-2 or both of them.
Rendimiento de semilla, y sus componentes en frijol flor de mayo en el Centro de México
Barrios-Gómez, Edwin J.;López-Castaeda, Cándido;Kohashi-Shibata, Josué;Acosta-Gallegos, Jorge A.;Miranda-Colín, Salvador;Mayek-Pérez, Netzahualcóyotl;
Agrociencia , 2010,
Abstract: in central méxico, flor de mayo (fm) bean (phaseolus vulgaris l.) is one of the most highly demanded commercial types. the objective of this study was to characterize fm type bean varieties for their seed yield and yield components under irrigation and rainfed conditions. during the spring-summer cycle of 2007, three experiments were designed in completely randomized blocks: one in celaya, state of guanajuato, with supplementary irrigation (single early irrigation), and one in montecillo, estado de méxico, under rainfed conditions. eight fm varieties and the variety michoacán 128 from the state of michoacán, méxico, were evaluated. all varieties were of type iii indeterminate growth habit. there were highly significant differences for environments and varieties, but not for the environment× variety interaction. on average, the environments of celaya resulted in higher seed yields, followed by montecillo under irrigation. on average, environment × variety (fm noura, anita and m38) produced higher seed yield, final aerial biomass, normal pods and seeds, and weight of 100 seeds (p<0.01). michoacán 128 showed the lowest values for seed yield and its components. seed yield was associated with final aerial biomass (r2=0.99**), normal pods (r2=0.75**), normal seeds (r2=0.71) and weight of 100 seeds (r2=0.6*). the most recently released varieties showed higher seed yield and values of its components, as well as final aerial biomass (p<0.01).
Synthesis of 1,2,5,7-dithiadiazonan-6-ylidenecyanamide. A New Potential Cysteamine Derivate Radioprotector Compound
Enrique Angeles,Italo Menconi,Alberto Ramírez,Ana María Velázquez,Brígida Camacho,Gerardo Ordónez,Ignacio Martínez,Sandra Díaz-Barriga,Rafael López-Casta?ares
Molbank , 2007, DOI: 10.3390/m550
Abstract: No abstract available
Temperatura base y tasa de extensión foliar en frijol
Barrios-Gómez, Edwin J.;López-Castaeda, Cándido;
Agrociencia , 2009,
Abstract: temperature is one of the most important abiotic factors that influence physiological and biochemical processes in the growth and development of plants. for bean (phaseolus vulgaris l.), it is postulated that the minimal temperature for growth is 10 °c. with this purpose, a foliar extension rate was calculated (fer, μm d-1) by measuring the central leaflet (mm) from the first trifoliated leaf at 18:00 and 06:00 h; in addition, the base temperature (tb , temperature at which growing stops) was calculated with the fer, in seedlings of commercial and creole bean varieties. therefore, two experiments were carried out in the open at the colegio de postgraduados, montecillo, méxico. experiment i (e-i) was from january 19th to february 8th and experiment ii (e-ii) from february 8th to the 27th in 2005. the seedlings were exposed to nocturnal environmental temperature (e-i, average maximum of 15.8 °c and average minimum of 3.9 °c; e-ii, average maximum of 16.0 °c and average minimum of 3.9 °c) from 18:00 to 06:00 h, with artificial light (800 μe m-2 s-1). the fer in e-i was 58.7 μm d-1 and 61.5 μm d-1 in e-ii, and the tb in e-i was 8.2 and 8.4 °c in e-ii, with an average value of 8.3 °c in both experiments. this value of the tb is useful for calculating the degree-day or development units of heat in mexican genotypes of bean.
EFECTO DEL NIVEL DE HUMEDAD Y NITRóGENO EN EL SUELO EN EL COMPORTAMIENTO DE MAíCES HíBRIDOS Y CRIOLLOS DE LOS VALLES ALTOS DE MéXICO
Cornelius Kibet Serrem,Cándido López-Castaeda,Josué Kohashi-Shibata
Agronomía Costarricense , 2009,
Abstract: El objetivo del presente estudio fue determinar si los híbridos de maíz (Zea mays L.) para secano, en la región de Valles Altos de México, producen mayor rendimiento de grano que los materiales criollos (CR) y si los híbridos modernos (HM) tienen mayor rendimiento de grano (RG) que los híbridos antiguos (HA) y los CR en sequía y con un nivel de N bajo. Se sembró 9 híbridos y 5 criollos en 4 ambientes en campo: riego (R) con la aplicación de agua de la siembra a la madurez; sequía (S) con la suspensión de agua desde los 40 días después de la siembra hasta la madurez; N alto (160 kg.ha-1); y N bajo (80 kg.ha-1). Los híbridos produjeron mayor rendimiento de grano (RG), biomasa aérea final (BM) e índice de cosecha (IC), y tuvieron mayor longitud de mazorca (LM), diámetro de mazorca (DM), hileras.mazorca-1 (HMZ) y granos.hilera- 1 (GH) que los CR en promedio de todos los ambientes. Los HM produjeron mayor RG, BM e IC, y tuvieron mayor LM, DM, HMZ y GH que los HA y los CR. También, los HM presentaron un intervalo antesis-floración femenina (A-FF) más corto y un intervalo floración femeninamadurez fisiológica más largo que los HA y CR. El RG fue significativa y positivamente asociado con BM, IC, LM, DM, HMZ, GH y FF-MF, y negativamente relacionado con el intervalo A-FF en todos los ambientes. La estrecha relación observada entre el rendimiento de grano y las otras características agronómicas determinadas en las plantas, podrían ser útiles para stablecer criterios de selección, más eficaces para el mejoramiento del rendimiento de grano en maíz, en condiciones deficitarias de agua y N.
Synthesis of 4-bromo-2-thiomorpholin-4-ylmethyl-1-phenol
Ana María Velázquez,Luis Alberto Torres,Raúl González,Alvaro Valencia,Sandra Díaz-Barriga,Italo Menconi,Luisa Martínez,Alberto Ramírez,Ignacio Martínez,Brígida Camacho,Rafael López-Casta?ares,Enrique Angeles
Molbank , 2007, DOI: 10.3390/m548
Abstract: No abstract available
Synthesis of 4-methoxy-2-thiomorpholin-4-ylmethyl-1-phenol
Ana María Velázquez,Luis Alberto Torres,Raúl González,Alvaro Valencia,Sandra Díaz-Barriga,Italo Menconi,Luisa Martínez,Alberto Ramírez,Ignacio Martínez,Brígida Camacho,Rafael López-Casta?ares,Enrique Angeles
Molbank , 2007, DOI: 10.3390/m547
Abstract: No abstract available
Relaciones hídricas y temperaturas altas en frijol del tipo “flor de mayo”
Barrios-Gómez,Edwin Javier; López-Castaeda,Cándido; Kohashi-Shibata,Josué;
Agronomía Costarricense , 2011,
Abstract: soil water deficit and high air temperature effects on plant water relations and canopy temperature (ct), and seed yield (sy) and its components in 8 “flor de mayo” (fm) bean varieties and a landrace were studied. three experiments were carried on under field conditions; montecillo irrigation (mi) with watering from sowing to maturity, montecillo rain-fed (mrf) with rainfall as the only source of water and celaya rain-fed (crf) with rainfall + 2 supplementary waterings at flowering. rates of 80 kg.ha-1 nitrogen and 40 kg.ha-1 phosphorous were used. leaf water (ψ=-0.33 mpa), osmotic (π=-1.26 mpa) and turgor (p=0.93 mpa) potentials at mi were higher than at crf (ψ=-0.77, π=-1.36 y p=0.59 mpa) and mrf (ψ=-1.22, π=-1.57 y p=0.35 mpa); mrf with a greater soil water deficit, showed greater reduction in ψ and π and higher capacity for osmotic adjustment (oa). oa was positive and significantly related to seed yield (sy) and final aerial biomass (fabm) in the 2 rain-fed environments. canopy temperature (ct) at mi (26.7°c) was lower than at crf (30.8°c) and mrf (36.6°c); the heat stress effect increased with the drop in plant water content in the driest environment (mrf); ct was negative and significantly associated with ψ and π at mrf. the high ct also had a significant effect in the fabm and sy, and its components; high ct reduced sy, fabm, number of normal pods.m-2 (np.m-2) and weight of 100 seeds (w100s) by 12.5, 10.7, 10.2 y 3.4% for each oc (-1oc) increase in ct, respectively.
RELACIONES HíDRICAS Y TEMPERATURAS ALTAS EN FRIJOL DEL TIPO "FLOR DE MAYO"
Edwin Javier Barrios-Gómez,Cándido López-Castaeda,Josué Kohashi-Shibata
Agronomía Costarricense , 2011,
Abstract: Se estudió el efecto del déficit hídrico del suelo y temperatura alta del aire en las relaciones hídricas y temperatura del dosel del cultivo (Tc), rendimiento de semilla (RS) y sus componentes en 8 variedades de frijol del tipo "Flor de Mayo" (FM) y una variedad criolla. Se realizaron 3 experimentos de campo; Montecillo en riego (MR) con la aplicación de agua de la siembra a la madurez, Montecillo en secano (MS) con la lluvia como fuente única de humedad y Celaya en secano (CS) con lluvia y 2 riegos suplementarios en floración. Se utilizó una dosis de fertilización de 80 kg.ha-1 de nitrógeno y 40 kg.ha-1 de fósforo. En MR el potencial hídrico foliar ( =-0,33 Mpa), osmótico ( =-1,26 Mpa) y de turgencia y (P=0,93 Mpa) fue más alto que en CS ( =-0,77, =-1,36 y P=0,59 Mpa) y MS ( =-1,22, =-1,57 y P=0,35 Mpa); MS, con mayor deficiencia hídrica del suelo, tuvo mayor reducción en y , y mayor grado de ajuste osmótico (AO=0,70 Mpa). El AO estuvo positiva y significativamente asociado con RS y biomasa aérea final (BMAF) en los 2 ambientes de secano. La Tc en MR (26,7°C) fue más baja que en CS (30,8°C) y MS (36,6°C); el estrés por calor se agudizó con el descenso en el contenido hídrico de las plantas en el ambiente más seco (MS); Tc se relacionó negativa y significativamente con y en MS. La alta Tc también tuvo efecto significativo en la producción de BMAF y RS y sus componentes; la alta Tc redujo el RS, BMAF, número de vainas normales.m-2 (VN.m-2) y peso de 100 semillas (P100S) en 12,5, 10,7, 10,2 y 3,4% por cada oC (-1 oC) de aumento en la Tc, respectivamente.
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