289 resultados para produtividade do milho


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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Agronomia - FEIS

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Agronomia - FEIS

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Como alternativa para aumento da produtividade dos sistemas de produção agrícola, surgiu o Sistema de Integração Lavoura-Pecuária. Desta maneira, o presente trabalho objetivou avaliar para o consórcio milho/Brachiaria submetido a doses de N em cobertura, em um Latossolo Vermelho distroférrico do sul do Estado do Mato Grosso do Sul nas condições de integração lavoura/pecuária, o seguinte: 1) os teores nutricionais e as leituras do índice de clorofila foliar (ICF) em folhas de milho, assim como os respectivos componentes da produção e a produtividade de grãos, objetivando caracterizar a melhor dose de N para o consórcio, e 2) em relação às espécies de Brachiaria, após o consórcio, com o objetivo de nortear a manutenção do SPD pesquisado, efetuaram-se avaliações da produtividade de fitomassa, dos teores nutricionais, da composição bromatológica e da taxa de decomposição da palhada, durante os anos agrícolas 2008/2009 e 2009/2010, na Fazenda de Ensino, Pesquisa e Extensão, da Faculdade de Engenharia - Unesp, Campus de Ilha Solteira, com histórico de oito anos sob SPD. O delineamento experimental utilizado foi o de blocos casualizados, com quatro repetições, em esquema fatorial 2 x 5, sendo duas espécies de Brachiaria (brizantha e ruziziensis) e cinco doses de N (uréia) em cobertura (0, 50, 100, 150 e 200 kg ha-1). A Brachiaria brizantha, no consórcio com o milho, foi a espécie menos competitiva. A adubação nitrogenada utilizada nessa consorciação, até a dose de 200 kg ha-1 de N, incrementou a nutrição, o crescimento, os componentes da produção e a produtividade de grãos do milho. Dessa forma, a adubação nitrogenada deve ser recomendada para o consórcio, e não isoladamente para as culturas. Embora tenha havido uma maior produtividade de massa seca da B. brizantha, a B. ruziziensis apresentou melhor composição bromatológica e...

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The expansion of the no-tillage system, in Brazil, has increasingly diversified the ways in which the production methods are established and managed. This study aimed at evaluating the influence of preceding crops such as mayze and Urochloa ruziziensis, as well as their intercropping, in the presence and absence of seed inoculation with Azospirillum brasilense, and the cover nitrogen supplying on common bean development, production components and grain yield. The study was carried out in Selvíria, Mato Grosso do Sul State, Brazil, in the 2011/2012 crop season. The experimental design was randomized blocks, with four replications, in a 8x4 factorial scheme, with treatments consisting of a combination of cover crops (associations of mayze, U. ruziziensis and A. brasilense) and cover nitrogen doses on common bean (0 kg ha-1, 30 kg ha-1, 60 kg ha-1 and 90 kg ha-1). The preceding crops affected the common bean grain yield, with the mayze and Urochloa intercropping, both inoculated, being the best option. The initial common bean population was not affected by previous crops. The cover nitrogen application did not affect the common bean grain yield under winter irrigation, for the no-tillage system.

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The effects on soil chemical properties brought about by cover crops vary considerably. This study was conducted to evaluate nutrient uptake by five cover crops used for grain, seed and forage production at different seed densities per hectare, as well as uptake by spontaneous vegetation, and their effect on the chemical properties of two Oxisols when grown in rotation with soybean and corn. The experiments were set up in Votuporanga, SP, Brazil and Selvíria, MS, Brazil in March 2008 after conventional soil tillage. A randomized complete block experimental design was used with four replications with the following cover crops at different seed densities: Sorghum bicolor at 6, 7 and 8 kg ha-1; Pennisetum americanum at 10, 15 and 20 kg ha-1; Sorghum sudanense at 12, 15 and 18 kg ha-1; hybrid of Sorghum bicolor with Sorghum sudanense at 8, 9 and 10 kg ha-1; and Urochloa ruziziensis at 8, 12 and 16 kg ha-1. We also used a spontaneous vegetation control. After management of the cover crops, in the first year of study, soybean was sown in no-tillage system and, in the second year, corn was sown, also in a no-tillage system. We evaluated the dry matter yield of different cover crops, nutrient uptake by the cover crops, and the chemical changes in the soil. It was found that in clayey soils with high aluminum content, as in Selvíria, sudan grass at a seed density of 18 kg ha-1, and sorghum at a seed density of 6 kg ha-1, in combination with liming, contributed to reduction of aluminum content and high potential acidity and an increase in base saturation. The different seed densities of each cover crop did not affect the dry matter yield of the cover crop itself, but affected nitrogen uptake of the hybrid Sorghum bicolor with Sorghum sudanense at a seed density of 10 kg ha-1, with lower uptake than at a seed density of 8 kg ha-1. Seed density also affected the organic matter content in the soil with sudan grass, with the seed density of 15 kg ha-1 providing more organic matter content than a seed density of 18 kg ha-1.

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The objective of this work was to evaluate the common bean response to N application timing, under no-tillage system, after single corn or intercropped with palisade grass. A randomized complete block experimental design was used in a split-plot arrangement, with four replicates. Plots consisted of: single corn crop or corn intercropped with palisade grass, in two summer cropping seasons precedent to common bean sowing. Subplots consisted of: 100 kg ha-1 N application in three times - before sowing, at sowing, and at side-dressing - and a control treatment without N application. Nitrogen fertilization on common bean increased leaf-N content, the number of pods per plant, and grain yield (33% in the average application timing), only in the cropping after single corn. By providing large mass production and by N cycling, the cultivation of palisade grass intercropped with corn reduced N requirement of common bean in succession, in comparison to previous sole corn cultivation. Early N application before or during common bean sowing time provides grain yield similar to the observed one in the side-dressing application.

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Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

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Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

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Pós-graduação em Agronomia (Produção Vegetal) - FCAV