为了降低田间杂草对苜蓿生长的危害,应用土壤封闭除草剂(33%施田补乳油、48%氟乐灵乳油和90%乙草胺乳油)在苜蓿播种前进行田间杂草防治试验,结果表明:三种药剂不同剂量处理对苜蓿出苗率均有一定影响,其中影响最大的是90%乙草胺乳油;而33%施田补乳油和48%氟乐灵乳油对苜蓿田杂草有良好的防控效果,用量(2 000³ 000)m L/hm2可有效防治苜蓿田间杂草86%以上,使苜蓿可增产15.47%~23.48%,其苜蓿草捆杂草含量降到5%以下。说明三种土壤封闭除草剂可有效防治苜蓿田间杂草,提高苜蓿产量改善草产品质量。

To reduce the harm of weeds in the field to the growth of Alfalfa, soil surface herbicides(pendimethalin EC 33%, trifluralin EC 48% and acetochlor EC 90%) shall be used to prevent and control weeds before sowing Alfalfa. It is found that: different dose of all the three drugs can bring certain effects on the emergence rate, in which, the significant influence is from acetochlor EC 90%, and pendimethalin EC33% and trifluralin EC 48% can bring good effects, the dose of(2 000³ 000) m L/hm2 can effectively control weeds more than 86%, and increase the production of Alfalfa by 15.47%~23.48% with weeds contents lower than 5%, which indicates that the three soil surface herbicides can effectively control weeds in Alfalfa grassland to improve the production and quality.