【摘要】 [目的]探讨3,5-二溴-4-羟基苯腈对田间杂草的防除效果。[方法]以自制的3,5-二溴-4-羟基苯腈乳油为供试药剂,通过田间小区试验研究其对玉米地杂草的防除效果。[结果]施药10d后,当3,5-二溴-4-羟基苯腈乳油的施药量为600g/hm2时,其对单子叶杂草防效为73.2%,远远高于对照药剂;两者对双子叶杂草的防效分别为96.6%和100.0%。施药20d后,当3,5-二溴-4-羟基苯腈乳油的施药量为300～600g/hm2时,其对单子叶杂草的株数和鲜重防效分别为25.0%～70.6%和0～51.8%,对双子叶杂草的株数和鲜重防效分别为21.6%～70.3%和95.9%～99.7%;而对照药剂对双子叶杂草的防效为100.0%。施药40d后,3,5-二溴-4-羟基苯腈乳油对单子叶杂草鲜重防效为51.5%～89.2%,对双子叶杂草鲜重防效为93.6%～97.0%。[结论]在3叶期后使用3,5-二溴-4-羟基苯腈防除玉米地杂草安全有效。更多还原

【Abstract】 [Objective] The purpose was to discuss the control effect of 3,5-dibromo-4-hydroxybenzonitrile on the weeds in field.[Method] With self-made 3,5-dibromo-4-hydroxybenzonitrile EC as tested herbicide,its control effect on the weeds in maize field was researched through field plot experiment.[Result] After 10 d since herbicide application,when the application dosage of 3,5-dibromo-4-hydroxybenzonitrile EC was 600 g/hm2,its control effect on monocotyledonous weeds was 73.2% and far higher than that of control herbicides;their control effects on dicotyledonous weeds were 96.6% and 100% resp.After 20 d since herbicide application,when the application dosage of 3,5-dibromo-4-hydroxybenzonitrile EC was 300-600 g/hm2,its control effects on the plant number and fresh weight of monocotyledonous weeds were 25.0%-70.6% and 0-51.8% resp.and that on the plant number and fresh weight of dicotyledonous weeds were 21.6%-70.3% and 95.9%-99.7% resp.;but the control effect of control herbicides on dicotyledonous weeds was 100.0%.After 40 d since herbicide application,the fresh weight control effect of 3,5-dibromo-4-hydroxybenzonitrile EC on monocotyledonous weeds was 51.5%-89.2% and its fresh weight control effect on dicotyledonous weeds was 93.6%-97.0%.[Conclusion] It was safe and effective to control the weeds in maize field with 3,5-dibromo-4-hydroxybenzonitrile after 3-leaf stage.更多还原