Relaçao entre parâmetros da chuva e perdas de solo e determinaçao da erodibilidade de um latossolo vermelho-escuro em Goiânia (GO)

Soil erodibility - its susceptibility to erosion - is usually expressed by the K factor of the universal soil loss equation. There have been relatively few papers in Brazil involving soil erodibility studies, due to the tardiness in obtaining results from natural rainfall experiments. The knowledge of erodibility is important for conservation planning, which contributes to soil sustainability. The present study was developed in the 1989 to 1993 period at the Empresa Brasileira de Pesquisa Agropecuaria - Centro Nacional de Pesquisa de Solos (EMGOPA/EMBRAPA-CNPS) Experimental Station, in Senador Canedo, Goiania county, State of Goias, Brazil. The objectives were to identify correlations between different rainfall parameters and soil losses, and to determine the erodibility for a clayey, cerrado phase, Dark Red Latosol (Anionic Acrustox), from the Goiania region, under natural rainfall. No significative difference was found between the correlation coefficients for the different rainfall parameters. The estimated erodibility (K factor) was 0.009 t h M/j/mm. It was observed that the erosivity (expressed ty the EI30 parameter) values above 500 MJ mm/ha/h/month were enough to cause soil losses beyond the tolerance for the studied soil (1.5 t/ha/month), indicating the need for conservation practices to maintain sustainability. (Résumé d'auteur