Control Effects of Different Herbicide Combinations for Weed in Dryland Rice

Purpose To analyze the effects of combined application of different herbicides on the agronomic traits, yield, and economic benefits of dryland rice, and comprehensively evaluate the weed control effects of the tested herbicide combinations, providing a scientific basis for economically and efficiently controlling weeds in dryland rice fields.

Methods Using the dryland hybrid rice Dianheyou 615 as the material, the study screened for the optimal combinations of pre-emergence (for soil) and post-emergence (for stem and leaf) herbicide treatments.

Results The control effects of different herbicide combinations on rice weeds in dryland were significantly different. The most effective combination was found to be a pre-emergence soil treatment with 10% bensulfuron-methyl wettable powder (0.30 kg/hm²)+60% butachlor emulsion in water (1.80 L/hm²), followed by a post-emergence stem and leaf treatment with 26% cyhalofop-butyl·fluroxypyr emulsifiable concentrates (0.53 L/hm²)+20% metamifop·cyhalofop-butyl emulsifiable concentrates (0.90 L/hm²). Under this combination, the control effects on the number of plants were 92.00% and 90.25% at 15 and 30 days after application, respectively; and on the fresh weight were 95.75% at 30 days after application. The combination was safe to dryland rice and could save cost and increase benefit.

Conclusion The selected herbicide combination is low-cost, high-return, and effective for weed control, providing a basis for the selection of efficient and safe herbicides for dryland rice cultivation.