合成3，5-二溴-4-羟基苯腈防治玉米杂草研究

［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/hm2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/hm2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。

Synthesis of 3,5-Dibromo-4-Hydroxybenzonitrile and Its Plot Experiments on Controlling the Weeds in Maize Field

[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 h...