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EFEITOS DE MANEJO E ROTAÇÃO DE CULTURAS EM ATRIBUTOS FÍSICOS DO SOLO

2007; Postgraduate Institute of Agriculture; Volume: 36; Issue: 1 Linguagem: Inglês

1016-1422

Américo Nunes da Silveira Neto, Pedro Marques da Silveira, L. F. Stone, Luiz Fernando Coutinho de Oliveira,

Growth and nutrition in plants

The objective of this study was to evaluate the effects of soil tillage and crop rotation systems on soil physical attributes. The experiment was conducted for five consecutive years and ten crop seasons in a dystrophic Oxisol in Santo Antonio de Goias, Goias State, Brazil, in a completely randomized design with four replications arranged in a 2 x 4 factorial split plot. Tillage systems were assigned to plots: (P1) no-tillage followed by plowing and (P2) continuous no-tillage; and crop rotations were assigned to subplots: (R1) millet - common bean - millet - common bean - rice - common bean - millet - common bean - millet - common bean, (R2) millet - common bean - soybean - common bean - rice - common bean - millet - common bean - corn - common bean, (R3) millet - common bean - millet - common bean - rice - common bean - corn - common bean, and (R4) soybean - common bean - corn - common bean - rice - common bean - soybean - common bean - corn - common bean. Tillage and crop rotation systems affected soil bulk density, macroporosity, and total porosity. Continuous no-tillage increased soil bulk density and decreased soil macroporosity and total porosity. Soil organic matter content was inversely correlated to soil bulk density and directly correlated to soil macroporosity. KEY-WORDS: Savannah; millet; corn; no-tillage; soybean; common bean.