Infiltração de água em um podzólico vermelho-escuro sob dois métodos de preparo, usando chuva simulada com duas intensidades

• Autor(a) principal: Alves, M. C. [UNESP]
• Data de Publicação: 1999
• Outros Autores: Cabeda, M. S. V.
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S0100-06831999000400001; http://hdl.handle.net/11449/114121
• topic: movimento da água; taxa de infiltração; características físicas; manejo e conservação do solo; water movement; infiltration rate; physical properties; soil management and conservation

A field experiment, arranged in a four-replication split-plot design, was conducted in a Dark-Red Podzolic (Paleudult) to study infiltration rates, ponding time and initial runoff under conventional and no-tillage methods, plots cultivated with oats (Avena strigosa) and soybeans (Glycine max), using simulated rainfall with constant mean intensities of 63.0 and 87.0 mm/h. A small rainfall simulator with 80-100 and 80-150 Veejet nozzles was used, and the test sites had 0.81 m². Smith's model was adjusted to the observed data. Ponding times and initial runoff times decreased with increasing rain intensity, being always smaller for no-tillage. Accumulated and constant rate of infiltration were greater for no-tillage. Constant rate of infiltration decreased with increasing rain intensity for conventional tillage, with no differences detected for no-tillage. The exponent b of the infiltration model showed a small variation and constant infiltration rates were slightly superestimated.