Dissertations and Theses

Summary

The objective of the study was to investigate the potential of magnetic susceptibility in the identification of landscape compartments detailed scale and its ability to assess soil quality conditions in areas subject to the cultivation of cane sugar handling system with sugarcane and sugar burned. Two experiments were conducted. At first, 60 points were sampled over two landforms (concave, linear), subdivided into three compartments of the landscape (upper slope, middle slope and lower slope) in depth from 0.00 to 0.15 m. For measuring the magnetic susceptibility of air dried soil (SMTFSA) and total sand fractions (SMAT) and clay (SMARG), we used an adapted analytical balance. The distinction of landscape compartments in principal component analysis was similar to the grouping obtained in cluster analysis, but this was used previously selected attributes. The cluster analysis, from the MS, the MS showed the ability to identify landscape compartments, because the clusters are in agreement with the division of the compartments. In the second experiment, we removed 20 soil samples from two areas, the first being submitted to the management system with sugarcane (CC), while in another, distant 100 m, there exists a system of management with burnt cane (CQ). We evaluated chemical attributes, physical and magnetic susceptibility (MS). The submission of SMTFSA SMARG and, to a cluster analysis, allowed the formation of two groups, which coincide with the division of different conditions of soil quality. The SM can be used as an indicator of quality (geophysicist) environments under management systems in cane sugar, which can be the tool that will enable detailed studies to characterize the spatial variability over large areas