拜田净防除水直播稻田杂草的效果

Effect of Herbicides-Baitianjing on the Control of Weeds in Directly Sowing Rice Field

试验表明 ,5 0 %拜田净WP对水直播稻田稗草、千金子具有良好的防除效果。对稗草的株防效 2 0d时为 71.4%～ 92 .9% ;40d时为 88.0 %～ 96.9% ;鲜重防效 40d时为 84.9%～ 98.6% ;与常规用药的禾大壮 +苄黄隆复配剂相当。对千金子的株防效2 0d时为 81.8%～ 10 0 % ;40d时为 78.9%～ 10 0 % ;鲜重防效 40d时为 93 .7%～ 10 0 % ,明显高于常规用药处理。对总草的防除效果亦优于常规处理 ,同时对水稻安全。建议在白湖圩区在应用时剂量选择 3 0 0～ 3 3 0g/hm2 ;并与苄黄隆等除草剂复配混用 。

The experiment indicated that 50% Baitianjing had good effect on the control of weeds in directly sowing rice field and its control efficiency to barnyardgrass in single plant was from 71.4%-92.9% when 20 days, 88.0%-96.9% when 40 days and in fresh weight, 84.9%-98.6% when 40 days, which was same as the conventional method. Its control efficiency to chinesis sprangletop in single plant was from 81.8%-100% when 20 days, 78.9%-100% when 40 days and in fresh weight, 93.7%-100% when 40 days, which was much better than that of the conventional method. And the control efficiency to all weeds was much better than that of the conventional method and also safety to rice plant. The concentration of the herbicides of 300-330g/667m 2 was suggested to apply in the area.