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[目的]比较5种除草剂对不同时期反枝苋的防除效果,评价减量用药可行性。[方法]在反枝苋不同生长期喷施除草剂,15 d后测定杂草干重。[结果]反枝苋2叶期时,使用溴苯腈、麦草畏防治,可降低除草剂的使用量。使用厂家推荐剂量甲基磺草酮/特丁津混剂也可有效防治,而特丁津、磺草酮防效不佳。在2叶期喷施5种除草剂,防效均优于4叶期。[结论]在反枝苋2叶期喷施合适除草剂,即使减量用药也能有效防治反枝苋。
[Objective] The research aimed to compare the control effects of five herbicides on the different stages of Amaranthus retroflexus and evaluate the feasibility of reducing the dosage. [Method] The herbicide was sprayed in different growth stages of Amaranthus retroflexus and the dry weight of weeds was measured after 15 days. [Result] When using 2-leaf stage of Amaranthus retroflexus, the use of bromoxynil and dicamba could reduce the amount of herbicide. The use of manufacturers recommended dose of mesotrione / Tretinoin mixture can be effective prevention and treatment, and tetrabutyl, sulcotrione poor control. Five herbicides were sprayed in the second leaf stage, and the control effect was better than that of the fourth leaf stage. [Conclusion] Spraying appropriate herbicide on the second leaf stage of Amaranthus retroflexus could effectively prevent and cure Amaranthus retroflexus even though the dosage was decreased.