不同除草剂对大豆田反枝苋的防除效果研究

The Control Effect of Several Soybean Herbicide to Amaranthus retroflexus

明确6种大豆田除草剂对反枝苋的防除效果。选用6种大豆田茎叶除草剂,灭草松、乙氧氟草醚、氟磺胺草醚、氯酯磺草胺、异噁草松、三氟羧草醚在反枝苋真叶期-1片互生叶期时进行茎叶喷雾处理,施药后30 d,调查反枝苋的株高抑制率、株防效、鲜重防效。结果表明,21.4%三氟羧草醚水剂对反枝苋的防效最好,基本达到100%;48%灭草松水剂和24%乙氧氟草醚乳油对反枝苋的防效较好,鲜重防效达到82.13%和72.43%;25%氟磺胺草醚水剂和48%异噁草松乳油对反枝苋的防效一般,鲜重防效达到55.27%和47.34%;84%氯酯磺草胺水分散粒剂对反枝苋的防效较差,鲜重防效最高为35.50%。

The objective of this study was to clarify control effects of some soybean fields herbicides to amaranthus retroflexus. Six kinds of soybean fields leaf herbicides, bentazon, oxyfluorfen, fomesafen, Choransulam-methyl, clomazone and acifluorfen were chosen and sprayed on amaranthus retroflexus at true leaf stage- 1 alternate leaf stage. After thirty days, inhibition rate of plant height, plant control, weight control were investigated. Results showed that the control effect of 21.4% acifluorfen was the best, which reached 100%; the effect of 48% bentazon and 24% oxyfluorfen was good, the weight control effect reached 82.13% and 72.43%; the effect of 25% fomesafen and 48% clomazone was just so so, the weight control effect reached 55.27% and 47.34%; effect of 84% Choran- sulam-methyl was poor, the best weight control was 35.50%.