Potencial de produtividade e variabilidade espacial de atributos físicos e químicos do solo em plantio direto de soja no município de Paragominas-PA.

Abstract

In order to evaluate the potential of productivity and the spatial variability of soil attributes in no-tillage soybean in the municipality of Paragominas in the state of Pará, a study was conducted at Fazenda Juparanã, in an area of ​​50 ha, within this area determined if 150 georeferenced points where, at each point, deformed soil samples were collected in the 0.0 - 0.20 deep layer and with undisturbed steel cylinders, the chemical variables of these samples were analyzed: pH in water and KC1, P, K, Ca, Mg, Al and physical: resistance to penetration, soil density, moisture in field capacity and texture. At each selected point, all soybean plants in the Im x Im area within the point were manually harvested and subsequently threshed, cleaned, dried and weighed to determine the productivity. The data were analyzed using semivariograms and kriging interpellation for map construction. The studied variables adjusted to the exponential, spherical, linear and Gaussian models. It was concluded that it was possible to determine the areas with high and low variability and to suggest establishment of homogeneous subareas, with the purpose of making resource management more efficient.