Efficacy of reduced rates of quinclorac applied with propanil or propanil plus molinate in dry-seeded rice (Oryza sativa)

Research was conducted from 1994 through 1996 to evaluate barnyardgrass control, rice yield, and estimated economic return with postemergence applications of propanil or propanil plus molinate applied alone or with quinclorac. Herbicides were applied at rates of 3.4, 2.8 + 2.8, and 0.17 to 0.40 kg ai ha−1for propanil, propanil plus molinate, and quinclorac, respectively. In most trials, combinations of propanil or propanil plus molinate applied with quinclorac provided greater barnyardgrass control, rice yields, and estimated economic returns than herbicides applied alone. Propanil or propanil plus molinate applied with quinclorac at 0.28 kg ha−1was as effective as propanil or propanil plus molinate applied with quinclorac at 0.40 kg ha−1. Applying quinclorac at 0.17 kg ha−1with propanil plus molinate was as effective as applying quinclorac at 0.28 or 0.40 kg ha−1with these herbicides.