Revista Brasileira De Herbicidas 2009; 8(3): 85-95
Effects of flumioxazin permanence period in soil and in corn and oat mulch on weed control efficacy
DOI: 10.7824/rbh.v8i3.71
This work aimed to evaluate the efficacy of flumioxazin applied over soil and over oat and corn mulch for controlling weeds, after different periods of permanence without rain. The experiment was carried out in vases, under greenhouse conditions in Botucatu County, São Paulo, Brazil. Vases were filled with soil, and weeds seeds of Brachiaria decumbens, Ipomoea nil, Digitaria spp, Bidens pilosa, Ipomoea grandifolia and Sida rhombifolia were sown and covered or not with oat and corn mulch, depending on the treatment used. For each coverage specie (oat and corn), treatments were constituted by factorial scheme 2 x 4, in randomized entirely design, with four repetitions, with two positions of herbicide application (over soil and over mulch) and four periods without occurrence of rain after herbicide application (1, 15, 30, and 60 days), besides checks without product application, in presence or absence of mulch. It was observed that flumioxazin application over corn and oat mulch promoted excellent weeds control levels. It was also observed a tendency of reduced control levels for some weeds species when the product was exposed for periods longer than 30 days between the application and the occurrence of rains.
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