Field experiments were conducted from 1994 through 1996 in dry-seeded and water-seeded Oryza sativa to compare weed control and O. sativa yield in conventional tillage and reduced tillage (stale seedbed and Triticum aestivum cover crop) systems with no in-season herbicide, propanil applied early postemergence (EPOST), and propanil EPOST followed by propanil plus molinate (dry-seeded production) or granular molinate (water-seeded production). The T. aestivum cover crop reduced Echinochloa crus-galli, Heteranthera limosa, Ammania coccinea, and Cyperus esculentus infestation and reduced the need for in-season herbicides in some but not all experiments. Oryza sativa grain yield was affected by both tillage systems and herbicide programs; however, these treatment factors influenced yield independently. Increasing the number of in-season herbicide applications increased weed control and O. sativa yield in some but not all experiments.
