Resumo

PIRES, R. O.; REIS, J. L.; SANTOS, F. L.  e  CASTANHEIRA, N. L.. Polyacrylamide application in center pivot irrigation systems for erosion and runoff control. Rev. de Ciências Agrárias [online]. 2007, vol.30, n.1, pp.162-171. ISSN 0871-018X.

Polyacrylamide was applied to several soils through a center pivot irrigation system to study their effects on erosion and runoff control. Tests were designed to apply the polyacrylamide to Vt, A, Bvc and Pmg Portuguese soils, and under two slopes, 2,5 and 5% respectively. Each soil was submitted to five irrigations, being the polyacrylamide applied on the following criteria: 1) one single application with the first irrigation at a concentration of 7 ppm (0,84 kg/ha), 2) two applications, first and second irrigation, at a concentration of 3,5 ppm (0,42 kg/ha each, and a total of 0,84 kg/ha), 3) three aplications, first, second and third irrigation, at a concentration of 2,33 ppm (0,28 kg/ha each, and a total of 0,84 kg/ha. The rates applied seem to better control erosion and runoff on soil A, being the best results obtained when the polyacrylamide was applied twice, in the first and second irrigation. On soil Vt the results are not so conspicuous, but the multi applications (three times) of polyacrylamide seem to provide some protection to soil against erosion. The same can be observed for soil Pmg. Soil Bvc does not require polyacrylamide applications to control erosion and runoff.

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