Rerbicide Screening and Effects on Millet Yield in Spring-seeding and Early-maturing Region

[ Objective ] Typos and dosages of herbicides suitable for spring-seeding and early-maturing region were confirmed, to provide technical support for popularization of simple and efficient cultivation techniques of millet in the region. [ Method] Four herbicides purchased from local agricultural market and two spraying methods were chosen to study plant control effect, fresh weight control effect, yield, emergence rate and plant height. [ Result ] The control effect of 10% monosulfuron against dicotyledonous weeds was more than 92%, and effects were consistent among five concentrations. Control effects against monocotylous and dicotyledonous weeds at 25 and 40 d post administration successively were atrazine sprayed after sowing and before seedling ≥10% monosulfuron ≥ MCPA- Na I〉 atrazine sprayed at 3 -5 leaf stage ≥ 2,4-D butyl ester. Spraying 3 000 and 4 500 g/hm2 atrazine after sowing and before seedling received the best effect. Spraying 2 250 and 3 000 g/hm2 10% monosulfuron and spraying 750 and 1 500 g/hm2 atrazine after sowing and before seedling increased the yield sig- nificantly. Treatments had little influence on seedling emergence included spraying 750 and 1 500 g/hm2 atrazine after sowing and before seedling, spraying 1 500 and 2 250 g/hm2 10% monosulfuron, and spraying 1 500 g/hm2 2,4-D butyl ester; spraying 10% monosulfuron and atrazine after sowing and before seed- ling inhibited growth strongly in the early stage. [ Conclusion] Suitable herbicides for the region were 10% monosulfuron with the dosage of 1 500 and 2 250 g/hm2 and atrazine sprayed after sowing and before seedling with the dosage of 1 500 g/hm2. Key words Herbicide for millet field; Screening; Yield