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Search Results: 1 - 10 of 144934 matches for " Bécquer Granados "
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Efecto de la inoculación con bacterias rizosféricas en dos variedades de trigo. Fase I: condiciones controladas The effect of innoculation with rhizospheric bacteria on two varities of wheat. Phase1: controlled conditions
Carlos José Bécquer Granados,Danielle Prévost,Christine Juge,Carole Gauvin
Revista mexicana de ciencias agrícolas , 2012,
Abstract: Se llevó a cabo un experimento bajo condiciones controladas para determinar la respuesta de dos variedades de trigo a la inoculación simple y combinada realizada con Sinorhizobium y Azospirillum. Se utilizó una cepa de A. zeae, y dos cepas pertenecientes a S. meliloti. Los materiales y métodos aplicados correspondieron a lo descrito en las metodologías prestablecidas en este campo de estudio. Dise o experimental: completamente aleatorizado, con 20 tratamientos y 4 réplicas. No se utilizó tratamiento fertilizado. Se evaluaron diferentes variables agronómicas, relacionadas con la arquitectura radical y la biomasa aérea. Análisis de varianza bifactorial. En caso de aparecer diferencias, se aplicó análisis de varianza de un factor a la interacción en primera instancia, o a los factores probados. Diferencias entre medias por LSD de Fisher. Se transformaron datos de conteo de dígitos por √x. Se calculó correlación y regresión múltiple entre variables. Se concluye que la inoculación combinada de Sinorhizobium con Azospirillum, así como la inoculación simple con Sinorhizobium, resultaron de alta importancia en las alternativas de inoculación que se realizaron en el experimento. Existió una alta diferenciación entre las dos variedades de trigo en determinadas variables agronómicas, lo que indica una influencia marcada de las características varietales de las plantas. Se observó una fuerte relación estadística entre las variables peso seco aéreo y variables de la raíz para los tratamientos inoculados con A2 y A2+N7, respectivamente. The experiment was carried out under controlled conditions to determine the response of the two wheat varieties to the simple inoculation and the combined inoculation which was carried out with Sinorhizobium, and Azospirillum. A strain of A. zeae and two strains belonging to S. meliloti were used. The materials and methods that were applied corresponded to what was described in the already established methodologies in this field of study. Experimental design: completely randomized, with 20 treatments and 4 replicas. Fertilizing treatment was not used. Different Agronomic variables were evaluated, related to the radical architecture and the biomass area. Analysis of the biofactorial variance. In the event that differences appeared, the variance analysis of a factor of first instance interaction or of approved factors was applied. Differences between methods by LSD of Fisher. Count data of digits by √x were transformed. The correlation and multiple regressions between variables were calculated. It is concluded that the combined inoculat
Efecto de la inoculación con bacterias rizosféricas en dos variedades de trigo. Fase II: invernadero Effect of inoculation with rihizospheric bacteria in two varieties of wheat. Phase II: greenhouse
Carlos José Bécquer Granados,George Lazarovits,Laura Nielsen,Maribel Quintan
Revista mexicana de ciencias agrícolas , 2012,
Abstract: Se llevó a cabo un experimento de invernadero para evaluar la influencia de la inoculación simple y combinada, efectuada con las bacterias rizosféricas Sinorhizobium y Azospirillum, en dos variedades de trigo. Materiales y métodos según lo descrito en las metodologías convencionales para este campo de estudio. El dise o experimental fue completamente aleatorizado, con 4 réplicas y 10 tratamientos. Análisis estadístico varianza bifactorial. Se utilizó tratamiento fertilizado con NH4NO3 (150 ppm/kg suelo). Se evaluó contenido de clorofila foliar, peso seco aéreo, peso seco radical, longitud del tallo y germinación. En caso de aparecer diferencias, se determinaron mediante la prueba de Duncan, y las diferencias entre las variedades con t-Student. Se concluye que la inoculación combinada de la cepaA2 (Sinorhizobium meliloti) con la cepaN7 (Azospirillum zeae), fue la de mayor influencia positiva en el contenido de clorofila de las plantas. Por otra parte, existió una alta diferenciación entre las dos variedades de trigo en la longitud del tallo, peso seco aéreo y peso seco radical. Los resultados en peso seco aéreo y peso seco radical, al combinarse los dos factores estudiados, dependieron notablemente de las características varietales de la planta y del efecto significativo de la población autóctona de rizobacterias. La germinación de las plantas no estuvo vinculada a ninguno de los factores aplicados en el experimento. The experiment was carried out in a greenhouse so that the inoculation, both simple and combined (with the rhizospheric bacteria- Sinorhizobium andAzospirllium), en two varieties of Wheat. Materials and methodologies were used in accordance with previously prescribed conventional methodologies for this study. The experimental design was completely randomized, with 4 replicas and 10 treatments. A statistical analysis using two-way variance was done. Fertilized treatment was applied with NH4NO3 (150 ppm/kg soil). The content of chlorophyll foliage was evaluated, dry air weight, dry root weight, length of stem, and germination. In the event that differences appeared, it was determined through use of the Duncan Test, and the differences between varieties with t-Student. It is concluded that combined inoculation with the strain A2 (Sinorhizobium meliloti) and the strain N7 (Azospirillum zeae) had the greatest positive influence on the chlorophyll content of the plants. On the other hand, there was a great difference between the two varieties ofwheat in terms of length of stem, dry air weight, and dry root weight. The results of dry air weight and
Respuesta de diferentes variedades de cereales a la inoculación con Bradyrhizobium sp. Response of different varieties of cereals to inoculation with Bradyrhizobium sp.
Carlos José Bécquer Granados,José ángel Nápoles Gómez,Orquidea álvarez,Yamilka Ramos
Revista mexicana de ciencias agrícolas , 2012,
Abstract: Se llevaron a cabo dos experimentos de campo durante 2009, en la Estación Experimental de Pastos y Forrajes Sancti Spiritus, Cuba (2 1o 53' 00" latitud norte, 79° 21' 25" longitud oeste y 40 msnm), para determinar la respuesta de diferentes variedades de cereales a la biofertilización con Bradyrhizobium sp. La preparación de los inóculos y la inoculación de las semillas, se efectuaron según metodologías prestablecidas para este campo de estudio. El dise o experimental fue a través de parcelas divididas y 4 réplicas por tratamiento. Al control fertilizado se le aplicó nitrógeno (150 kg N ha-1) y se evaluaron diferentes variables agronómicas. Se aplicó análisis de varianza bifactorial; las diferencias entre medias se determinaron por la dócima de comparación de Duncan y t-student. En el experimento con Triticum se concluye que los tratamientos con mejores respuestas, fueron Triticale-inoculado y a IRM37-inoculado y que Triticum secale superó en peso seco raíz y en longitud del tallo a T. aestivum, lo que hace a esta primera especie promisoria para condiciones de sequía. En el experimento con Zea mays se concluye que aunque en peso seco aéreo los mejores tratamientos correspondieron a la fertilización química, en peso seco de la mazorca el tratamiento Canilla-inoculado, presentó valores estadísticamente iguales al de los tratamientos fertilizados, por lo que se considera positiva la respuesta de esta variedad a la biofertilización. No obstante, no se descarta la influencia de las bacterias rizosféricas autóctonas en algunas de las variables estudiadas. Two field experiments were performed in 2009 at the Experimental Station of Pastures and Forages Sancti Spiritus, Cuba (21° 53' 00" north, 79° 21' 25" west longitude and 40 m) to determine the response of different varieties of cereals to bio-fertilization with Bradyrhizobium sp. The preparations of inocula and seed inoculation were made according to preset methodologies for this field of study. The experimental design was through split-plots and 4 replicates per treatment. The fertilized control was applied with nitrogen (15 0 kg N ha-1) and agronomic variables were evaluated. We applied two-factor analysis of variance; the differences betweenmeans were determined by Duncan and t-student comparison. In the experiment with Triticum, we concluded that, the treatment with the best responses was Triticale- inoculated and IRM37-inoculated and that, Triticum secale exceeded on root dry weight and stem length compared with T. aestivum, which makes this first promising species for drought conditions. In the experim
Respuesta de diferentes variedades de cereales a la inoculación con Bradyrhizobium sp.
Bécquer Granados, Carlos José;Nápoles Gómez, José ángel;álvarez, Orquidea;Ramos, Yamilka;Quintana, Maribel;Galdo, Yaldreisi;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: two field experiments were performed in 2009 at the experimental station of pastures and forages sancti spiritus, cuba (21° 53' 00" north, 79° 21' 25" west longitude and 40 m) to determine the response of different varieties of cereals to bio-fertilization with bradyrhizobium sp. the preparations of inocula and seed inoculation were made according to preset methodologies for this field of study. the experimental design was through split-plots and 4 replicates per treatment. the fertilized control was applied with nitrogen (15 0 kg n ha-1) and agronomic variables were evaluated. we applied two-factor analysis of variance; the differences betweenmeans were determined by duncan and t-student comparison. in the experiment with triticum, we concluded that, the treatment with the best responses was triticale- inoculated and irm37-inoculated and that, triticum secale exceeded on root dry weight and stem length compared with t. aestivum, which makes this first promising species for drought conditions. in the experiment with zea mays is concluded that, even though air dry weight treatments were best with chemical fertilization, in dry weight of the ear canilla-inoculated treatment showed statistically equal to that of the fertilized treatments, so it's considered a positive response of this variety to bio-fertilization. however, the influence of indigenous rhizosphere bacteria in some of the studied variables is not ruled out.
Relatoría del I Concurso Nacional de Historia de la Estomatología Proceedings of the First National Competition of Stomatology History
Jorge Luis Bécquer águila
Revista Cubana de Estomatolog?-a , 2011,
Abstract:
Selección de rizobios adaptados a ecosistemas ganaderos de Sancti Spíritus, Cuba, inoculados en maíz (Zea mays, L.): Fase I: Invernadero
Bécquer,C.J; Salas,Beatriz; Archambault,D; Slaski,J; Anyia,A;
Pastos y Forrajes , 2008,
Abstract: a greenhouse trial was carried out with the objective of selecting rhizobia strains inoculated in corn (zea mays, l.). thirty cuban native strains belonging to bradyrhizobium sp. were used, as well as 12 commercial strains belonging to different rhizobium genera and species. the inoculi were made in bym medium and were shaken until reaching a titer of 106-108 cel./ml. the standard methods for cereal inoculation were used. the variables evaluated were: aerial dry weight (adw), root dry weight (rdw), stem length (sl), stem diameter (sd) and presence of ears (pe). in the variables adw, sl and sd treatments higher than the absolute control were found, and in the case of sl, two treatments showed values without significant differences with the fertilized control. no statistical differences were found among treatments in pe. in rdw the inoculated treatments were lower than the fertilized control, except ji2, td1, sp7 and sp12. a grouping in clusters was obtained, by means of which the strains td, jk, sp, sp, te, jk, sp, usda 110, ji, jj, usda 76, sp20, 25b6, nitragin, atcc 10317, were selected, which stood out to be evaluated later under field conditions. the treatments selected in the dendrogram constituted 69% for the native strains and 31% for the commercial ones. when evaluating the inoculated treatments regarding the degree of dependence of the different variables with regards to rdw, the regression index was determined to be weak, but when analyzing them separately, a strong regression was observed in the variables sd (native strains) and adw (commercial strains). to continue these studies under field conditions is recommended.
Inoculación de trigo (Triticum aestivum, L.) con rizobios adaptados a ecosistemas ganaderos de Alberta, Canadá
Bécquer,C.J; Salas,Beatriz; Archambault,D; Slaski,J; Anyia,A;
Pastos y Forrajes , 2007,
Abstract: a greenhouse experiment was carried out in order to select rhizobium strains inoculated on wheat (triticum aestivum, l., var. cdc teal). for that 16 canadian native strains, belonging to sinorhizobium medicae, as well as 12 commercial strains, were used. the inocula were prepared in ymb medium and shaken up to obtain a title of 106-108 cells/ml. the standard methods for the inoculation of cereals were used. a dendrogram was constructed by means of the ward's method (square euclidian distance). the variables: aerial dry weight (adw), dry weight of root (dwr), stem length (sl), dry weight of spikes (dws) and number of shoots (ns) were evaluated. a significant increase was observed in all the variables in the treatments inoculated with the native strains and the commercial strains of rhizobium, as compared to the absolute control. in aerial dry weight, dry weight of spikes and dry weight of root, most of the treatments did not differ significantly from the fertilized control. in stem length there were 17 treatments statistically higher than the fertilized control. ten strains were selected from the total. the treatments selected in the dendrogram constituted 31% for the native strains and 42% for the commercial strains. field trials with the strains selected inoculated on cereals of economic interest for cuba are recommended.
Selección de rizobios adaptados a ecosistemas ganaderos de Alberta, Canadá, inoculados en maíz (Zea mays, L.).: Fase I: invernadero
Bécquer,C.J; Salas,Beatriz; Archambault,D; Slaski,J; Anyia,A;
Pastos y Forrajes , 2008,
Abstract: a greenhouse experiment was conducted in order to select rhizobium strains inoculated on corn (zea mays, l.), for which 16 canadian native strains of sinorhizobium meliloti, as well as 12 commercial strains, belonging to different rhizobium genera and species, were used. the inoculi were prepared in bym medium and shaken to obtain a titer of 106-108 cells/ml.. the variables evaluated were: aerial dry weight (adw), root dry weight (rdw) and stem length (sl). in all the variables some inoculated treatments were observed to be statistically higher than the absolute control. in adw two treatments did not differ significantly from the fertilized control; while only four inoculated treatments in sl and five in rdw were statistically lower than the fertilized control. cluster analysis allowed to select the strains cac8, cac9, cac17 and cac17a, for their later evaluation under field conditions. one hundred percent of the treatments selected in the dendrogram were inoculated with native strains. when evaluating the treatments regarding the level of dependence of adw and sl with regards to rdw, a strong regression of adw was observed in the ones inoculated with native strains, and a weak regression in the treatments inoculated with commercial strains. the regression was weak in sl for all treatments. to continue this research under field conditions, in addition to further studies, is recommended.
El humanismo de un científico insigne de la estomatología cubana
Bécquer águila,Jorge Luis; Vila Morales,Dadonim; Ota?o Laffitte,Gladys María;
Revista Cubana de Estomatolog?-a , 2011,
Abstract: it is difficult to summarize en a few pages the brilliant life of a person honoring the stomatology sciences in cuba and in latin america. for everybody knew him, the professor rigoberto ota?o lugo was always a symbol of camaraderie, diplomacy and politeness with everybody. present paper is a historical review to collect biographical data more general of the deceased professor of the stomatology faculty of the university of la habana, cuba. to this end authors interviewed in an open way to colleagues and relatives shared with him many years of work. the documentary sources included the staff file of such academic institution. information was organized taking into account four basic features: its political and teaching-assisting performance, its scientific activity in the international scenario of the stomatology, as well as the medals received. its simplicity and faith in the human improvement were distinctive qualities. its wide smile and its maxim of never to hurt to nobody will be always remembered for all colleagues and friends.
Efecto de la inoculación con rizobios procedentes de Alberta, Canadá, en sorgo (Sorghum bicolor L. Moench), en condiciones de campo Effect of the inoculation with rhizobia from Alberta, Canada, in sorghum (Sorghum bicolor L. Moench), under field conditions
C. J Bécquer,Beatriz Salas,U ávila,L. A Palmero
Pastos y Forrajes , 2011,
Abstract: Se realizó un experimento de campo con el objetivo de medir el efecto de cepas de rizobio en las variables agronómicas del sorgo, en las condiciones ambientales de Sancti Spíritus, Cuba. Se utilizaron 10 cepas de Sinorhizobium meliloti, procedentes de ecosistemas ganaderos de Alberta, Canadá; así como cuatro cepas de referencia pertenecientes a diferentes géneros y especies de rizobio, que procedían de la colección de Agriculture and AgriFood Canada. La confección de los inóculos y la inoculación de las semillas se realizaron por métodos estándar. El dise o experimental fue de bloques al azar, con 16 tratamientos y cuatro réplicas. Se evaluó el peso seco aéreo, la longitud del tallo y la longitud de la panoja; además, se calculó el incremento del peso seco aéreo en los tratamientos inoculados con relación al control absoluto. Los resultados demostraron la capacidad de las cepas estudiadas de influir en las variables agronómicas, ya que los tratamientos seleccionados igualaron sus valores a los del control fertilizado y presentaron un incremento de más del 100% del peso seco aéreo, comparado con el control absoluto. A field trial was conducted with the objective of measuring the effect of rhizobium strains on the agronomic variables of sorghum under the environmental conditions of Sancti Spiritus, Cuba. Ten Sinorhizobium meliloti strains, from livestock production ecosystems of Alberta, Canada, were used; as well as four reference strains belonging to different rhizobium genera and strains, which were from the collection of Agriculture and AgriFood Canada. The inoculi confection and seed inoculation were made by standard methods. The experimental design was randomized blocks, with 16 treatments and four replications. The dry aerial weight, stem length and ear length were evaluated; in addition, the increase of aerial dry weight was calculated in the inoculated treatments as compared to the absolute control. The results proved the capacity of the studied strains to influence the agronomic variables, because the selected treatments equaled their values to those of the fertilized control and showed an increase higher than 100% of the aerial dry weight, with regards to the absolute control.
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