VARIABILIDADE ESPACIAL DE ATRIBUTOS FÍSICOS EM SOLO SUBMETIDO À DIFERENTES TIPOS DE USO E MANEJO

Abstract

It characterization of the variability of soil attributes is necessary so that we can interpret the possible causes of variations in crop yields, because the soil has, naturally, heterogeneity its attributes. Thus, the objective of this study was analyze the spatial variability and dependecy, through the tool GS+, the physical attributes of a typic fluvia underwent two systems use and management of soil: disking and mowing lines. The area managed by disking for over 10 years has 0.5 ha and the area mowing between the lines 13 years ago has 2.3 ha both located on the systematic plan of Experimental Farm in the Valley Curu, Pentecoste. Soil samples were taken in both disturbed and undisturbed areas obeying the spacing of 15 x 15 m, 21 in the area with har- rowing and 78 in the area by mowing between the rows. The density was the only attribute which there wasn’t spatial dependence structure. The other attributes (sand, clay, silt, micro and macroporosity and gravimetric soil moisture and the mechanical resistance to penetration) showed spatial dependence of medium until high. It was observed in the mowing area is made between the lines showed lower values macroporosity and high penetra- tion resistance, the constraint condition for the growth of roots.