Weed control in rice is challenging, particularly in light of increasedresistance to herbicides in weed populations and diminishing availability ofirrigation water. Certain indica rice cultivars can produce high yields andsuppress weeds in conventional flood-irrigated, drill-seeded systems in thesouthern United States under reduced herbicide inputs, but their response toreduced irrigation inputs in these systems in not known. Rice productivityand weed control by weed-suppressive cultivars and conventionalnonsuppressive cultivars were evaluated in a nonflooded furrow-irrigated(FU) system and a conventionally flooded (FL) system under three levels ofweed management (herbicide inputs) in a 3-yr field study. Rice yields acrossall weed management levels yielded ∼ 76% less in the FU system than in theFL system. The allelopathic indica cultivar, ‘PI 312777’, and commercialhybrid rice ‘CLXL729’ generally produced the highest grain yields andgreatest suppression of barnyardgrass in both irrigation systems. ‘Bengal’and ‘Wells’ were the top-yielding conventional cultivars whereas ‘Lemont’and ‘CL171AR’ yielded the least. Weed suppression by PI 312777 and CLXL729under “medium” weed management was equivalent to that of Lemont and CL171ARat the “high” management level, suggesting that the weed-suppressivecultivars may be able to compensate for suboptimal herbicide inputs orincomplete weed control.