Selectivity and residual weed control of pre-emergent herbicides in soybean crop

Considering the complexity of using these products, the objective of this work was to evaluate their selectivity and residual weed control in soybean crops and their effect on the weeds Amaranthus hybridus, Bidens pilosa, Digitaria insularis, Eleusine indica, and Euphorbia heterophylla. [...]tolerant soybean cultivars may respond differently to stress caused by herbicides due to genotypic differences (Lima et al., 2011). [...]the selectivity and effectiveness of residual herbicides need to be better understood in current production systems, considering mainly the adopted crop system and the new available soybean cultivars. [...]the objective of the present work was to evaluate the selectivity and residual weed control of pre-emergent herbicides applied before and at the sowing of soybean crops. Weed control at post-emergence of the soybean crops was carried out in the whole area at 15 days after emergence, using glyphosate (Roundup DI®, Monsanto, St. Louis, United States) at 6 L of the commercial product per hectare, clethodim (240 g L-1) (Select 240 EC®; UPL Ltd, Mumbai, India) at 0.45 L of the commercial product per hectare), and the adjuvant (Lanzar®; UPL Ltd, Mumbai, India) 0.5% v v', at a flow rate of200 L ha-1.