Correlation of TOC and porosity OXISOL with different uses and management in region of Uberaba, MG

Abstract

The Cerrado is the second largest biome. Before the Development of the Cerrado (POLOCENTRO) and the Program for Japanese-Brazilian Cooperation in Developing the Cerrado (PRODECER) program, the Cerrado soils were not as grown, with less economic value compared to other regions in Brazil. The objective of this study was to quantify the changes imposed on the density, porosity and organic carbon content in Cerrado areas, eucalyptus and corn and pasture tillage rotation at Fazenda Santa Therese, Uberaba - MG. Disturbed samples were collected in the layers of 0-20 cm and 20-40 cm for soil organic carbon (TOC) determination and analyzes of chemical and particle size, and the undisturbed samples for analyzes of soil density (Ds), microporosity (Mi), macroporosity (Ma) and total porosity (Pt). It was found that there was higher TOC content in the depth of 0 to 20 cm. Relative to the use of the soil, the corn area's TOC was higher in relation to the TOC of the Cerrado area. DS was higher in the depth of 0 to 20 cm and in the areas occupied by pasture and corn. For Ma, Mi and Pt, the areas occupied by cerrado and eucalyptus had similar results, showing that in the absence of human interference the system is able to reestablish. The pastures and corn showed similar average for Ma, Mi and Pt, respectively, 0.11; 0.30 and 0.41; 0.07; 0.30 and 0.41. However, these were less than ideal.