1,720,958 research outputs found
Efeito do rizobacterias promotoras do crescimento de plantas sobre a produção de biomassa, rendimento e qualidade dos grãos da cultura do amendoim (Arachis hypogaeaL.)
Full text linkPonencia presentada en XVII Encontro e II Feira Nacional do Amendoim. Modalidad Virtual, 10 al 14 de agosto de 2020Fil: Bigatton, Ezequiel Darío. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Microbiología Agrcola; Argentina.Fil: Bigatton, Ezequiel Darío. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Centro Científico Tecnológico (CCT Córdoba); Argentina.Fil: Haro Juarez, Ricardo Javier. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi; Argentina.Fil: Haro Juarez, Ricardo Javier. Universidad Católica de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Ayoub, Ibrahim. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Castillejo Sánchez, María Ángeles. Universidad de Córdoba. Departamento de Bioquímica y Biología Molecular; España.Fil: Lucini, Enrique Iván. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Microbiología Agrcola; Argentina.La provincia de Córdoba en la República Argentina concentra más del 85% del área sembrada con cultivos de Maní(280-317 mil hectáreas por año). Para lograr altos rendimientos, los productores utilizan grandes cantidades de insumos de síntesis industrial como son los fertilizantes químicos. Una alternativa complementaria a la fertilización es la utilización de microorganismos asociados a la rizosfera vegetal (PGPR). Las PGPRs pueden inducir el crecimiento vegetal en forma directa o indirecta. Pseudomonas y Bacillus son los géneros más importantes incluidos dentro de esta clasificación. Primero, se aislaron cepas nativas de los géneros Pseudomonas y Bacillus a partir de suelos provenientes del cultivo de maní y luego se caracterizaron. El cultivar Granoleico fue sembrado para evaluar el efecto de las PGPRs sobre la producción de biomasa (Kg ha-1) y el rendimiento (Kg ha-1). El experimento fue conducido a campo y las plantas crecieron sin limitaciones hídricas. Los resultados demostraron el efecto positivo de promoción del crecimiento por parte de las PGPRs. Pseudomonas spp. cepa 001 incrementó el rendimiento 50% en relación con el control sin microorganismos y el 82% de los granos producidos se clasificaron como granos confitería (+8% en relación con el control sin microorganismos). La cepa 002 y cepa 001 de Bacillus spp. Incrementaron el rendimiento 42% y 20% respectivamente y el 80% y 80.1% de los granos producidos fueron clasificados como grano confitería. Estos resultados parciales reforzarían a las PGPR como una alternativa sustentable a la producción, pero será necesario nuevos estudios para evaluar sus efectos y estabilidades ante la diversidad de ambientes.Córdoba province (Argentina) concentrates more than 85% of the total area sown with peanut crop (280-317 M. hectares per year). To achieve competitive yields, farmers use large amounts of chemical fertilizers and other synthetic supplies. Toprovide microorganisms into the plant rhizosphere,(PGPR) is a complementary agricultural management. PGPRs could induce plant growth directly or indirectly. Pseudomonas and Bacillus are the main genera included in this classification. First, native strains of gender Pseudomonas and Bacillus were isolated from soils previously sown with peanut crop and then they were characterized. The Granoleico cultivar was sown to evaluate the PGPR effects on biomass production (kg ha-1) and yield (kg ha-1). A trial was carried out in field conditions and plants grew without water limitations. The results showed the PGPR`s positive effects on growth. The strain 001 of Pseudomonas spp. increased the peanut yield 50% concerning the control (without microorganisms) and 82% of grains were classified as confectionery grain(+8% more than the control). The 002 and 001 strains of Bacillus spp. increased the peanut yield 42% and 20%, respectively, and 80% and 80.1% of the total grains were classified as confectionery grain. These results strengthen to PGPRsas a sustainable alternative to crop production but additional research is needed to assess the effects and stabilities of PGPRin contrasting environments.O Estadode Córdoba, na República Argentina, concentra mais de 85% da área plantada com a cultura do amendoim (280-317 mil hectares por ano). Para alcançar rendimentos competitivos, os produtores utilizam grandes quantidades de insumos sintetizados industrialmente, como os fertilizantes químicos. Uma alternativa para complementar à fertilização,é o uso de microrganismos associados à rizosfera da planta (RPCP). As RPCPs podem induzir o crescimento das plantas direta ou indiretamente. Pseudomonas e Bacillus são os gêneros mais importantes incluídos nesta classificação. Inicialmente, as cepas nativas dos gêneros Pseudomonas e Bacillus foram isoladas nos solos da cultura do amendoim e, em seguida, foram caracterizadas. A cultivar Granoleico foi plantada para avaliar o efeito das RPCPs nas variáveis de crescimento. O experimento foi realizado em campo e as plantas cresceram sem limitações de água. Os resultados demonstraram efeito positivo da promoção do crescimento pela RPCP. Para as Pseudomonas spp.,a cepa 001 aumentou o rendimento em 50% em relação ao tratamento controle (sem microrganismos) e 82% dos grãos produzidos foram classificados como grãos de confeitaria (+ 8% em relação ao controle, sem microrganismos). Para a cepa 002 e cepa 001 de Bacillus spp., orendimento aumentou 42% e 20%, respectivamente e 80% e 80,1% dos grãos produzidos foram classificados como grãos de confeitaria. Esses resultados reforçam que as RPCPs são alternativas sustentáveis para à produção, mas é necessário continuar investigando para avaliar seu efeito e estabilidade em diferentes ambientes.Fil: Bigatton, Ezequiel Darío. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Microbiología Agrcola; Argentina.Fil: Bigatton, Ezequiel Darío. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Centro Científico Tecnológico (CCT Córdoba); Argentina.Fil: Haro Juarez, Ricardo Javier. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi; Argentina.Fil: Haro Juarez, Ricardo Javier. Universidad Católica de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Ayoub, Ibrahim. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Castillejo Sánchez, María Ángeles. Universidad de Córdoba. Departamento de Bioquímica y Biología Molecular; España.Fil: Lucini, Enrique Iván. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Microbiología Agrcola; Argentina
Plant-growth promoting rhizobacteria on peanuts: Effects on yield determination, growth rates, and radiation use efficiency in field trials in Argentina
No full textPlant growth-promoting rhizobacteria (PGPR) are an alternative to enhance crop productivity and reduce the environmental footprint in crop production systems. The main objective of this study was to determine the effects of PGPR inoculation on peanuts under field conditions. The specific objectives were to: i) assess the impact on yield generation and its components, ii) determine the effects on crop and pod growth rates and biomass partitioning, and iii) analyze the effects of PGPR inoculation on radiation use efficiency. The experiments (Expn) were conducted under field conditions during two growing seasons (2019–2020 and 2020–2021) in two locations in the center of Argentina. Two peanut cultivars (CV) (ASEM 400 INTA and Granoleico) were sown on four contrasting sowing dates (SD) (Oct-15, Nov-11, Nov-29, and Dec-10). The effect of three PGPR strains and Bradyrhizobium japonicum on different crop traits was evaluated. The studied PGPR were Bacillus velezensis, strains RI3 and SC6, and Pseudomonas psychrophila, strain P10. A control treatment without inoculation was included in the Expn. In Exp1 and Exp3, treatments were arranged in a split-plot randomized complete block design with cultivars in the main plot and PGPRs in the sub-plot. In Exp2, a split-split-plot randomized complete block design was set, where the main plot was sowing dates, cultivars in the sub-plots, and PGPRs in the sub-sub-plot. In all the Expn, three replicates were set with 36.4 m2 plots. PGPR improved peanut yield by 33% on average. The seed yield (SY) was strongly associated with the seed number (SN) in both CVs R2 = 0.88 – 0.90; p < 0.0001). The seed weight (SW) increased with PGPR (+18%; 0.64 g seed-1), especially in early SD. The SN was positively (p < 0.0001) associated with CGRR3-R6.5 (R2 = 0.66 – 0.70) and pod growth rate (PGRR3-R6.5; R2 = 0.71 – 0.63). Furthermore, the PGPR increased the CGRR3-R6.5 by 28% (14 – 26 g m-2 day-1) and the PGRR3-R6.5 by 30% (6 – 14 g m-2 day-1). High growth rates were associated with a higher harvest seed index (HIS) (0.19 – 0.20). The PGPR application increased the RUE by 12 – 18%, mainly driven by total biomass (TB) increases. These PGPR-enhanced growth traits could be partly explained by increased levels of Auxins (22%), Gibberellins (23%), and Cytokinins (27%). This study evidences the effects of PGPR on improving peanut production via increased crop growth rates and radiation use efficiency.Fil: Bigatton, Ezequiel Darío. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Recursos Naturales. Cátedra de Microbiología Agrícola; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Ayoub, Ibrahim. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Recursos Naturales. Cátedra de Microbiología Agrícola; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Palmero, Francisco. Kansas State University; Estados UnidosFil: Castillejo Sánchez, María Ángeles. Universidad de Córdoba; EspañaFil: Vázquez, Carolina. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Recursos Naturales. Cátedra de Microbiología Agrícola; ArgentinaFil: Lucini, Enrique Iván. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Recursos Naturales. Cátedra de Microbiología Agrícola; ArgentinaFil: Haro Juarez, Ricardo Javier. Instituto Nacional de Tecnología Agropecuaria; Argentin
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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