Preemergence and postemergence interactions of saflufenacil in corn (Zea mays L.).

摘要

Studies were conducted under field and growth room conditions to explore the tolerance of corn to postemergence treatments of saflufenacil and BAS 781 (saflufenacil plus dimethenamid-p), and to determine the safening effect of sodium compounds on saflufenacil applied postemergence. Saflufenacil and BAS 781 applied at the 3-to-4 leaf corn stage caused up to 28 and 65% injury, respectively, resulting in yield loss. The addition of Na-bentazon and baking soda to saflufenacil reduced this injury by decreasing foliar herbicide uptake. Field studies were conducted with BAS 781 applied preemergence to evaluate overall and species specific weed control, as well as the dose required for weed control when followed with glyphosate. The GR₉₅ across locations ranged from 126 to 675 g/ha. Common ragweed was the most difficult weed to control; the GR₉₅ was 933 g/ha. When followed by glyphosate, 46 to 1470 g/ha of BAS 781 resulted in optimum yields.