Particle size of sediment yielded by interrill erosion under different soil residue cover and by rill erosion on a Paleudult sandy loam soil

Braida, J.A.; Cassol, E.A.

Pesquisa Agropecuaria Gaucha 3(2): 191-198


Accession: 003224715

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Two field experiments were conducted at the Forest and Soil Conservation Research Center, from FEPAGRO, in Santa Maria, State of Rio Grande do Sul, Brazil, on a Paleudult sandy loam soil, to determine the particle size distribution, from interrill and rill erosion processes. In the first experiment, residues of wheat and maize were applied as a surface cover on small interrill plots of 0.50 x 0.75 m, at amounts of 0.00, 0.05, 0.10, 0.20, 0.40 and 0.80 kg/msuperscript 2, in four replications on freshly tilled soil, with an average land slope of 0.17 m/m. A simulated rainfall with intensity of 67 mm/h was applied for 90 minutes and runoff samples were taken to determine the sediment particle size distribution. In a second field experiment, concentrated flow rates of 10, 20, 30, 40 and 50 dmsuperscript 3/min were produced and the particle size distribution of the lost sediment was determined. The yield and particle size distribution of sediment eroded from the different plots was compared and the effect of plant residues on the erosion process discussed.