二甲戊灵和丙炔氟草胺对棉田一年生杂草的防治效果

Control effects of pendimethalin and flumioxazin to annual weeds in cotton field

【目的】分析评价二甲戊灵乳油(EC)与丙炔氟草胺可湿性粉剂(WP)单剂及其混配后对棉田一年生杂草的安全性和防治效果,为棉田杂草的化学防治提供科学依据。【方法】研究不同处理对棉田一年生杂草药后30 d株防效,45 d的株防效和鲜重防效,分析各处理药剂对棉花出苗的安全性。【结果】供试药剂对棉花出苗无影响,各处理出苗率与空白对照相比无显著性差异。330 g/L二甲戊灵EC(742.5 g/hm^(2))+50%丙炔氟草胺WP(45 g/hm^(2))和330 g/L二甲戊灵EC(866.25 g/hm^(2))+50%丙炔氟草胺WP(60 g/hm^(2))对棉田一年生杂草30 d株防效分别为96.52%和97.91%,45 d株防效分别为95.86%和96.48%,45 d鲜重防效分别为92.89%和94.44%,2种药剂混配后对棉田一年生禾本科、阔叶杂草均有较好的防治效果。330 g/L二甲戊灵EC 866.25~990 g/hm^(2)对棉田一年生禾本科杂草株防效和鲜重防效在83.58%~90.23%,50%丙炔氟草胺WP 60~75 g/hm^(2)的处理为84.58%~90.98%,二者差异不显著,该剂量下二甲戊灵对棉田一年生阔叶杂草株防效和鲜重防效在82.62%~88.90%,丙炔氟草胺的处理防效为85.06%~92.21%。【结论】丙炔氟草胺对棉田一年生阔叶杂草的株防效和鲜重防效优于二甲戊灵,可根据棉田优势杂草群落结构的差异选择不同的药剂施用,合理防治棉田杂草。

【Objective】To evaluate the control effect of pendimethalin EC,flumioxazin WP and their mixture to annual weeds and safety to cotton in the hope of providing scientific reference for chemical control to weeds in cotton field.【Methods】Plant control effect,fresh effect of 30 days and 40 days to annual weeds and safety to cotton after herbicides application were studied.【Results】The results showed that there were no difference of treatments on safety to cotton,and no significant difference on seedling emergence rate between each treatment and blank control.Plant control effects of 330 g/L pendimethalin EC(742.5 g/hm^(2))+50%flumioxazin WP(45 g/hm^(2))and 330 g/L pendimethalin EC(866.25 g/hm^(2))+50%flumioxazin WP(60 g/hm^(2))to annual weeds after 30 days were 96.52%and 97.91%,95.86%and 96.48%after 45 days,fresh weight control effects were 92.89%and 94.44%after 45 days,respectively.The mixture of pendimethalin and flumioxazin had significant effect on annual gramineous and broad-leaved weeds in cotton fields.The plant and fresh weight control effects of 330 g/L pendimethalin EC 866.25-990 g/hm^(2) to annual gramineous weeds were between 83.58%to 90.23%,and the effects of 50%flumioxazin WP 60-75 g/hm^(2) were between 84.58%to 90.98%,no significant difference between them.The plant and fresh weight control effects of 330 g/L pendimethalin EC 866.25-990 g/hm^(2) to annual broad-leaved weeds were between 82.62%to 88.90%,and the effects of 50%flumioxazin WP 60-75 g/hm^(2) were between 85.06%to 92.21%.【Conclusion】The plant and fresh weight control effect of flumioxazin to annual broad-leaf weeds are higher than that of pendimethalin,which can be applied selectively according to difference dominant weeds population for reasonable controling weeds in cotton field.