72%异丙甲草胺乳油对蔗田杂草的防除效果

Control Effect of Metolachlor 72% EC on Weeds in Sugarcane Fields

为了明确异丙甲草胺在甘蔗大培土后芽前土壤处理对甘蔗田杂草的防除效果,通过田间试验研究了72%异丙甲草胺乳油不同剂量对甘蔗田杂草的防除效果及对甘蔗的安全性。结果表明:在5月底6月初甘蔗大培土后、杂草萌发前施用剂量为1500mL/hm2和1950mL/hm2的72%异丙甲草胺乳油,药后20天对蔗田单子叶杂草和双子叶杂草的株防效均达95.1%以上,药后40天株防效均达92.0%以上,鲜重防效达93.9%以上;其中1950mL/hm2的使用剂量40天的株防效分别为95.7%和94.9%,鲜重防效为95.5%,且对甘蔗安全。

In this paper, the safety and control effects of different dosages of metolachlor 72% EC were evaluated in sugarcane fields. The results showed that, pre-emergence application of metolachlor 72%EC with 1500 mL/hm2 and 1950 mL/hm2 after large earth-up in late May to early June could effectively control the weeds, control effects on mono-and dicotyledonous weeds were greater than 95.1%after a 20-day treatment, more than 92.0%after a 40-day treatment on weeds number, while over 93.9%on fresh weight of weeds after a 40-day treatment. The control efficiencies of metolachlor 72%EC treatment at a dosage of 1950 mL/hm2 after 40-day of treatment were 95.7% and 94.9% on mono- and dicotyledonous weeds number, respectively, and 95.5%on fresh weight of weeds. Observation was also suggested that application of metolachlor 72%EC was safety to sugarcane.