DENSIDADE DO SOLO E TEOR DE MATÉRIA ORGÂNICA EM SOLO SOB USO EM SISTEMA AGRÍCOLA CONVENCIONAL E VEGETAÇÃO NATIVA NO NOROESTE DO PARANÁ

Abstract

The removal of the original vegetation cover and the implantation of crops, conciliated with non-conservationist management practices, propel the disruption of the soil-environment balance, altering its chemical, physical and biological properties. The objective was to perform a comparative analysis of soil density and organic matter in two soil management and occupation systems. To this end, areas of a rural property that make up the caiua sandstone were selected, one with intensive and soil-intensive agricultural use and the other in native vegetation. The historical use of the areas and soil samples were collected for laboratory analysis at different depths, from 0-0.05; 0.05-0.10; 0.10-0.15 meters along the profile. To evaluate the density, the volumetric ring method was used. For organic matter from loss of ignition calcination. Statistical analyzes were performed by Sisvar and graphs by Statistic. The results showed higher content of organic matter in the area with native vegetation and higher density in the area with conventional agricultural system. The depths from 0.05 to 0.10 m presented the highest OM contents. With the results it was possible to conclude that the presence of OM is important to combat the erosive processes and improve the aggregation of the sandstone soils.