Herbicides carryover effects for the crop Crambe abyssinica in succession

Abstract

Herbicides applied in previous crop may present residual effects, causing injuries in the crop in succession. Furthermore, it essential the research of tolerant crops to possible residual effects which is denominated like carryover. The objective of this research was to evaluate the carryover effects of the herbicide associations adopted in the desiccation for the soybean cultivate, in Crambe abyssinica FMS-Brilhante cultivar, grown in succession. The experiment was established and conducted in a completely randomized experimental design, with eight treatments and three replications. Treatments were: glyphosate (1,300 g a.e. ha^-1), glyphosate + 2,4-D (1,300 g a.e. + 1,005 g a.e. ha^-1), glyphosate + (paraquat + diuron) [1,300 g a.e. + (600 + 300 g a.i. ha^-1)], glyphosate + carfentrazone-ethyl (1,300 g a.e. + 40 g a.i. ha^-1), glyphosate + saflufenacil (1,300 g a.e. + 24,5 g a.i. ha^-1), glyphosate + flumioxazyn (1,300 g a.e. + 35 g a.i. ha^-1), glyphosate + diclosulam (1,300 g a.e. + 25 g a.i. ha^-1), glyphosate + chlorimuron-ethyl (1,300 g a.e. + 20 g a.i. ha^-1). After soybean harvest, it was sown the crambe crop. The evaluations were based on the determination of the plants population, at 30 days after sowing, dry biomass at flowering (45 days after sowing). At 90 days after sowing, it was evaluated the agronomic characteristics and yield of the crambe crop. It was concluding that the glyphosate association with the studied herbicides, when adopted in system of “applies and plant” the soybean, has no carryover effects for crambe crop when cultivated on clayey soils.