The research evaluated the development of winter species under dijferent distances between superficial drainage channeis as well as the ejfect of animal stepping on the physical properties of an Albaqualf soil located in Santa Maria, Brazil 1996. The experimental design was a split piot, where the main plots were distances between drainage channeis, 4, 8, 12 and 16 meters and subplots were the winter species: Avena strigosa, Lolium multiflorum, L. multiflorum + Trifolium repens, L. multiflorum + T. vesiculosum, L. multiflorum + Lotus corniculatus, L. multiflorum + Ornitophus micranthus. Drainage leveis were evaluated by coilecting plant dry matter on every metter from the drainage channeis to the piot conter. Grazzing began 75 days after plant emergence (DAE) with an adequate animal load, each one weighting between 150 and 200kg. No difference was observed on the development of the species due to dijferent distances between superficial drainage channels. In regard to soil physical properties, fhey were ajfected by the animal stepping. It was observed an increase on the soil superficial density and a decrease in microporosity, macroporosity and total porosity.
superficial density; physical properties; animal stepping
