Weed competition is a major constraint to the productivity of broadcast-seeded rice. Although manual weeding controls weeds effectively, because of the absence of rows, it is difficult, time consuming, and costly. In addition, labor is scarce. Butachlor, the recommended herbicide, controls weeds effectively, but is toxic to germinating rice seedlings. The use of a safener, an antidote, protects rice seedlings from butachlor injury effectively without any adverse effect on weed control.