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[目的]明确40%氰氟草酯.二氯喹啉酸WP防除直播水稻田禾本科杂草的效果和使用剂量,为大面积推广应用提供科学依据。[方法]以浙辐203为供试水稻品种,施药试验设8个处理,4次重复,采用随机区组设计,在直播水稻3叶1心期施药,施药时稗草处于2.5~3.5叶期、千金子处于1.5~2.0叶期。[结果]40%氰氟草酯.二氯喹啉酸WP在直播水稻3叶1心期施药,可有效地防除稗草和千金子等禾本科杂草,用药量900~1 800 g/hm2,施药后45 d对禾本科杂草总草株防效、鲜重防效分别达93.64%~94.86%和93.89%~95.12%,显著高于对照药剂10%氰氟草酯EC 750 m l/hm2、50%二氯喹啉酸WP 450 g/hm2及人工除草处理。[结论]40%氰氟草酯.二氯喹啉酸WP在直播水稻3叶1心期施药防除效果显著,其经济有效用量为900 g/hm2。
[Objective] The aim of the study was to determine the effect and dosage of quinclorac with 40% dichloroquinic acid to control weeds in direct-seeded rice fields and provide a scientific basis for its widespread application. [Method] With Zhefu 203 as the tested rice variety, 8 treatments and 4 replications were conducted in the experiment. The randomized block design was used to apply the rice in the 3 leaves and 1 period of direct seeding rice. 3.5 leaf period, a thousand gold at 1.5 to 2.0 leaf stage. [Result] 40% Cyhalofop-methyl-quinclorac WP was applied in the 3-leaf stage of direct seeding rice, which could effectively control weeds such as barnyardgrass and cadmium. The dosage was 900-1 800 g / hm2 , 45 d after the application of grass weeds on the control of total grass, fresh weight control effect was 93.64% ~ 94.86% and 93.89% ~ 95.12%, significantly higher than the control agent 10% Cyanuric chloride EC 750 ml / hm2, 50% quinclorac WP 450 g / hm2 and artificial weeding. [Conclusion] The control efficacy of 40% Cyhalofop-ethyl-Quinclorac WP in the 3-leaf-1 direct seeding of direct-seeded rice was significant, and its economic effective amount was 900 g / hm2.