Dissertations and Theses
Soil-landscape-erosion relationship and spatial variability of latosols in areas under sugarcane cultivation in the municipality of Jaboticabal (SP)
Author: Cleber Kouri de Souza
Keywords: landform, soil-landscape relationships, natural erosion potential, erodibility
Summary
The objective of this work is to evaluate the spatial distribution of soil attributes and coffee crop productivity in areas with different management systems: conventional system and organic system, aiming at the definition of specific management areas. Soils were sampled at regular spacing of 15m in the transect and 16m between transections in depth of 0-20cm. It was determined the organic matter, phosphorus, potassium, base sum, cation exchange capacity, base saturation, boron, copper, iron, manganese, zinc and crop production in the 2003/2004 and 2004/2005 harvests. For each of the soil attributes studied and crop productivity, the parameters of descriptive statistics, semivariograms and isovalues maps were obtained. The mean values, for most of the attributes analyzed, were found in the organic system. The conventional system presented the greatest variability of the data expressed by the highest coefficient of variation values. The lowest reaches, for most attributes, were observed in the conventional system. From the isovalor maps it was possible to visualize the spatial distribution of soil fertility levels, suggesting different management for each area. Therefore, the study of the spatial variability of soil attributes and crop production associated to the isovalor maps, aid in the characterization and differentiation of specific areas of management