514 resultados para atributos químicos e físicos
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This study aim to evaluate the spatial variability of soil physical attributes in of Alfissol forest in Manicoré region, AM. The mapping of an agroforestry growing area of 70×70m was made using a regular grid sampling of 10 × 10m. In each grid, soil samples were collected at 0.0-0.2 and 0,40-0,60 m depth, with a total of 128 sample points. Physical analyses were made (texture, soil bulk and particles density, macro and microporosity, total porosity and aggregates stability in water). With the exception of DMG, DMP and class aggregates <1.00 mm had all the physical attributes spatial dependence structure ranging from moderate to weak. Values were above the range established in the mesh (12.00 to 45.56 m), enabling to make a basis for future studies in forest area. The physical attributes presented in kriging maps different spatial behavior, however there are relationships between these attributes shown by geostatistics proving that this is effective tool for studies in forest area.
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Sewage sludge, waste with high organic matter content and rapid decomposition, combined with sawdust, rich in carbon and slow decomposition, are suitable components for the study of degraded areas. In order to test the interactions of these residues in the recovery of a degraded soil in Selvíria - MS, four doses of sewage sludge (0, 8, 16 and 24 t ha -1, dry basis ) and four doses of sawdust particles (0, 8, 16 and 24 t ha-1, dry basis ) were tested in February 2009, in a completely randomized block design (4 × 4 + 1 factorial), with four replications. As indicators of the effects, the penetration resistance, gravimetric moisture and soil bulk density (0-0.10, 0.10-0.20; 0.20-0.40 m) were used. Significant effects were observed for the factors (sewage sludge and sawdust) and control treatment for penetration resistance in the soil depths studied, for gravimetric moisture in the intermediate layer and for the soil density in the surface and intermediate layers. Considering the type of soil and the short period of study (24 months), the use of organic wastes presented improvement in physical properties of soil in relation to control. However, it is necessary to study them for a longer period.
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Pós-graduação em Aquicultura - FCAV
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Ciência Florestal - FCA
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Pós-graduação em Agronomia (Produção Vegetal) - FCAV
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Agronomia (Energia na Agricultura) - FCA
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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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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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)