Spatial and temporal variability of crop yield and some Rhodic Hapludox properties under no-tillage Variabilidade espacial e temporal da produtividade de culturas e atributos de um Latossolo sob semeadura direta
Soil properties are closely related with crop production and spite of the measures implemented, spatial variation has been repeatedly observed and described. Identifying and describing spatial variations of soil properties and their effects on crop yield can be a powerful decision-making tool in spe...
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Veröffentlicht in: | Revista brasileira de ciência do solo 2010-02, Vol.34 (1), p.1-14 |
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Sprache: | eng |
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Zusammenfassung: | Soil properties are closely related with crop production and spite of the measures implemented, spatial variation has been repeatedly observed and described. Identifying and describing spatial variations of soil properties and their effects on crop yield can be a powerful decision-making tool in specific land management systems. The objective of this research was to characterize the spatial and temporal variations in crop yield and chemical and physical properties of a Rhodic Hapludox soil under no-tillage. The studied area of 3.42 ha had been cultivated since 1985 under no-tillage crop rotation in summer and winter. Yield and soil property were sampled in a regular 10 x 10 m grid, with 302 sample points. Yields of several crops were analyzed (soybean, maize, triticale, hyacinth bean and castor bean) as well as soil chemical (pH, Soil Organic Matter (SOM), P, Ca2+, Mg2+, H + Al, B, Fe, Mn, Zn, CEC, sum of bases (SB), and base saturation (V %)) and soil physical properties (saturated hydraulic conductivity, texture, density, total porosity, and mechanical penetration resistance). Data were analyzed using geostatistical analysis procedures and maps based on interpolation by kriging. Great variation in crop yields was observed in the years evaluated. The yield values in the Northern region of the study area were high in some years. Crop yields and some physical and soil chemical properties were spatially correlated.Os atributos do solo condicionam a produção das culturas e, apesar das práticas adotadas, a variação espacial destes tem sido recorrentemente encontrada e descrita. A caracterização da variabilidade espacial dos atributos do solo e de seus efeitos sobre a produtividade das culturas pode ser utilizada como uma poderosa ferramenta para tomada de decisão em sistemas de manejo específico. O objetivo deste trabalho foi caracterizar a variabilidade espacial e temporal da produtividade de culturas e de atributos químicos e físicos de um Latossolo Vermelho distroférrico sob semeadura direta. A área estudada está localizada no Centro Experimental Central do Instituto Agronômico, em Campinas, SP, e vem sendo cultivada desde 1985 no sistema de semeadura direta com sucessão de culturas no verão e no inverno. As amostragens de produtividades e dos atributos do solo foram realizadas conforme uma grade regular de 10 x 10 m, totalizando 302 pontos. Para este estudo foram analisadas as produtividades de algumas culturas (soja, milho, triticale, labelabe e mamona) e |
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ISSN: | 0100-0683 1806-9657 |
DOI: | 10.1590/S0100-06832010000100001 |