ERODIBILITY, SOIL COVER AND MANAGEMENT AND CONSERVATION PRACTICES IN RAINFED ULTISOL

作者：Eduardo Eliete Nazare^*; de Carvalho Daniel Fonseca; Machado Roriz Luciano; Chaves Soares Paula Fernanda; de Almeida Wilk Sampaio

来源：Revista Brasileira de Ciencia do Solo, 2013, 37(3): 796-803.

DOI：10.1590/S0100-06832013000300026

• water erosion
• USLE
• K factor
• C factor
• P factor

The soil loss prediction models have become important tools for conservation planning, being fundamental the local estimation of the parameters that influence the erosion processes. The objective of this work was to determine the soil erodibility (K factor), soil cover and management factor (C factor) and conservation practice factor (P factor) of the Universal Soil Erosion Equation (USLE), in an Ultisol. Soil losses (SL) were measured in Wischmeier standard-plots from 2006 to 2011, with the respective erosivity index (EI30). Soil erodibility was calculated by the ratio of SL and the annual (Ka) and total period EI30 (Kt), considering the angular coefficient generated from the linear regression analysis between those parameters (Kci, for each rainy period, and Kct, for the studied period). The factors C and P were estimated for three years of maize in contour cultivation (MCL) and down in the slope (MDS). The Kt and Kct values were 0.0090 and 0.0106 Mg ha h ha(-1) MJ(-1) mm(-1), respectively. The average calculated values for factors C and P are 0.0070 Mg ha Mg-1 ha(-1) and 0.45, respectively, indicating a soil loss reduction of 55 % in MCL, compared to MDS. The values of the factors K, C and P obtained can be used as first approximation to soil and water conservation management projects in the region.

• 出版日期2013-6