Atributos físicos e matéria orgânica em sistemas de uso do solo.

Abstract

The different types of land use, coupled with the various techjniques of cultivation with mechanized cause changes in soil properties, these changes can be physical, chemical and biological. The objective ofthis study was to analyze the physical properties of soil in three different systems of land use: Secondary vegetation, cultivation of citrus and pasture area abandoned in the town of Capitão Poço City, Northeast of Pará State. Soil samples were collected with samples of 50x50m spacing perpendicular totaling 24 points, at a depth of 0-7 cm. In each sample were determined bulk density, total porosity, macroporosity, microporosity, water retention curve and soil resistance to penetration. The results indicate lower values of bulk density and higher total porosity, organic matter content and water retention in the soil in the area of secondary vegetation. The area under citrus cultivation had the highest bulk density, and less water available to plants, however, does not restrict the ground physically.