Residual effect of pyroxasulphone and pyroxasulphone + flumioxazin on contrasting soils

Abstract

It aimed to evaluate the residual effect of pyroxasulfone and pyroxasulfone + flumioxazin on different soil textures. Experiments were carried out in Red Latosol and Quartzarenic Neosol, using two doses of pyroxasulfone (100 and 200 g i.a. ha-1) and pyroxasulfone + flumioxazin (100 + 66.67 and 200 + 133.33 g i.a. ha-1), seven application times (0, 15, 30, 45, 60, 75 and 90 days between herbicide application (DAA) and sowing of the bioindicator). phytointoxication, plant height, root length and total dry biomass are honored. The effects on cucumber were exciting as application times increased. The clayey soil administered greater residual effect. The highest doses of both herbicides promoted greater effects in all evaluated periods. The residual effect was more expressive when applying pyroxasulfone + flumioxazin, in both soils and doses. Pyroxasulfone and pyroxasulfone + flumioxazin showed a residual effect greater than 90 DAA in clayey and sandy loam soils.