Simulated drift of dicamba and 2,4-D on soybeans: effects of application dose and time
Keywords:Glycine max (L.), Merrill, Auxin herbicides, Soybean-resistant herbicides
The use of soybean varieties resistant to the herbicides dicamba and 2,4-D may lead to drifts towards areas grown with non-resistant varieties. The aim of this study was to evaluate the effects of dicamba and 2,4-D underdoses applied at the phenological stages V4 and R2 of soybeans. Two experiments were conducted with dicamba or 2,4-D in a randomized block design with four replications. The 4 × 2 + 1 factorial scheme was composed of four doses (0.028, 0.28, 2.8, and 28 g ae ha−1) of dicamba or 2,4-D applied at two phenological stages (V4 and R2) + a control treatment (without herbicide application). Dicamba underdoses caused damage to soybean crop affecting its vegetative growth and yield; the injuries caused by 2,4-D were neither enough to damage crop nor affect yield components. Dicamba underdoses applied at V4 caused injuries of up to 41%, while in R2 they reached 70%. Plant height decreased by up to 61% when treated with dicamba. Soybean yield was reduced by 29 and 76% when the simulated drift occurred at V4 and R2, respectively, and at a dose of 28 g ae ha−1 of dicamba. For the tested underdoses, only 2,4-D had no effect in soybean crop yield.
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Copyright (c) 2020 Estevam Matheus Costa, Adriano Jakelaitis, Jacson Zuchi, Leandro Spíndola Pereira, Matheus Vinícius Abadia Ventura, Gustavo Silva de Oliveira, Gustavo Dorneles de Sousa, Jeovane Nascimento Silva
This work is licensed under a Creative Commons Attribution 4.0 International License.