Potencial de produtividade e variabilidade espacial de atributos do solo em plantio direto de soja no nordeste paraense

Abstract

The objective was to use the techniques of precision agriculture to assess the potential produetivity and spatial variability of chemical and physical attributes of soil no-tillage on soybean in northeastem Pará. The study was conducted at the Beira Rio, the municipality of Capitão Poço, PA, in an area of 39.52 ha, where he is collecting samples ofsoil layer from 0.0 to 0.05 m deep. For the analysis of physical and chemical soil and soybean yield were selected 196 points. We analyzed the chemical variables; pH in water and KC1, P, K, Ca, Mg, Al and physical properties: resistance to penetration, bulk density, moisture at field capacity and texture. The data were analyzed using semivariograms and kriging for the construction of maps. The variables were adjusted to exponential models, spherical and Gaussian. It was concluded that it was possible to determine the areas with high and low variability and suggest the establishment of homogeneous subareas, in order to make resource management more efficient.