1000 resultados para Sistemas de semeadura
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
The purpose of this work was to assess the effects of soil preparation methods (with or without subsoiling) on physical properties of a cerrado soil cropped to corn during the, 1986/87 season, in the Selviria county (Mato Grosso do Sul, Brazil). Also, the objective of this was to check the changes in the soil (dark red latosol-Acrustox) caused by the preparation after nine years of cultivation in comparison with natural state. The experiment consisted of six soil preparation systems: conventional, superpreparation, reversed, revolving hoe, reduced and no-tillage. Along with these systems subsoiling was also tested. The reversed system showed the best com grain yield. Subsoiling only presented positive results in productivity with the no-tillage system. All the preparation system tested degraded the physical properties in comparison with the natural soil.
Resumo:
Management systems affect soil structure, causing changes in porosity that can influence water infiltration into the soil. This study aimed to evaluate the effect of different management systems on the porosity and water infiltration in Distroferric Red Nitosol with clay texture. The management systems were: conventional with disc plow + two soft harrowing, conventional with heavy disc harrow + two soft harrowing, no tillage and fallow. The following attributes: porosity, pore shape and water infiltration velocity into the soil were determined. Management systems such as no-tillage, conventional with disc plow and heavy disc harrow, and fallow modify the porosity and the shape of pores of a Distroferric Red Nitosol, influencing water infiltration, which was favored in no-tillage for the greater presence of elongated pores.
Resumo:
The study of nutrient uptake is of fundamental importance to plant nutrition, as well as tell the time (growth stage) being absorbed by the culture, also signals to the levels of fertilizer to be used. Aiming to establish the uptake of nitrogen for cultivation of cotton (Gossypium hirsutum L. r. latifolium Hutch.) led to an experiment in a Alfissol under randomized block design with two treatments, sowing conventional tillage and after tillage on the straw of previous crop (millet), with five replicates. Samples were taken according to the phenology and plants development. The dry matter accumulation in cotton is linear and increasing until the period of large boll, being more intense with the appearance of flowers and boll, or 50 to 100 days after emergence. The nitrogen content is higher in newly emerged plants, having peaks at the beginning of the appearance of squares and flowers, and from the appearance of small boll, the nitrogen content in the plant decreases linearly. The extraction of nitrogen is bigger from the appearance of flowers (55-60 days after emergence).
Resumo:
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
Pós-graduação em Agronomia (Agricultura) - FCA
Resumo:
Pós-graduação em Agronomia (Agricultura) - FCA
Resumo:
Pós-graduação em Agronomia (Ciência do Solo) - FCAV
Resumo:
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Resumo:
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
Pós-graduação em Agronomia (Produção Vegetal) - FCAV
Resumo:
Pós-graduação em Agronomia (Proteção de Plantas) - FCA