CROSTA SUPERFICIAL E EROSÃO EM ENTRESSULCOS EM DUAS CLASSES DE SOLOS DO ESTADO DA PARAÍBA

Abstract

Soil erosion is a complex phenomenon that involves detachment, transport and deposition of soil particles. Several are the consequences of erosion. However, the erosion in interrill is one of the most harmful forms because it removes the most superficial layer of soil, where organic matter, nutrients and agricultural inputs, favoring agricultural production. The objective of this study was to evaluate the soils with different levels of development pedogenetic formation of surface crust and how this interferes with interrill erosion from rainfall simulation laboratory. For this study were selected two soils, according to the degree of pedogenetic development, representative of the state of Paraíba, being Entisol (less developed) and Oxisoil (most developed), both the towns of Areia and Pocinhos respectively. Soil samples were collected at 0-20 cm deep. The tests were performed on plots in the laboratory where they were applied in three events sequenced, separated by a period of seven days. Detachment rates were evaluated, soil loss and soil erodibility in interrill, and characterization of hydraulic variable flow. According to the results, the first simulation had the highest soil loss rates and detachment rate, with a decrease in these rates over the simulations. The differences between the simulations were due on conditions for soil resistance, which vary according to the application of rainfall simulations.