Papers

Summary

The principal objective of this study was to determine the nutrient losses from interrill, rill and global erosion (interrill + rill, A) in an area cultivated with sugarcane at Santa Bárbara farm, in the region of Guariba (SP), in a Typic Haplustox, very clayey texture. The cane was burnt prior to harvest. The plots were submitted to a rainfall simulation at intensity of approximately 80 mm h-1 for about 65 minutes. Analyses of the sediment indicated much higher enrichment ratio: 1.62 (organic matter, OM); 4.30 (P); 1.17 (K); 1.33 (Ca) and 1.24 (Mg) times when compared with the original soil. The nutrients and the soil losses in function of the erosion type have the following order: rill > interrill > large plots. Geostatistical analyses indicated that the soil erosion (A) and OM, P, K e Ca losses have a strong spatial dependence degree, while Mg losses have a moderate spatial dependence degree. Distribution maps showing spatial patterns variability of the erosion losses indicated that sugarcane culture conserves the soil chemical and physical properties in the greatest part of the area. IZIDORIO, Ricardo et al. Perdas de nutrientes por erosão e sua distribuição espacial em área sob cana-de-açúcar.