不同除草剂对糜子田杂草的防除效果

Control Effect of Different Herbicides on Weed in Broomcorn Millet Field

摘要以黄黍子为材料，以喷清水不除草作为对照，研究在糜子4-5叶期喷施56％二甲四氯钠盐可湿性粉剂、72％2，4-D丁酯乳油及人工除草对糜子田杂草的防除效果，为筛选适宜糜子田的除草剂种类提供依据。结果表明：二甲四氯钠盐可湿性粉剂和2，4-D丁酯乳油对糜子田阔叶杂草均有一定的防除效果，平均株防效分别为69．33％、39．62％；与人工除草相比，两种除草剂导致糜子产量分别下降10．27％、12．47％，但与喷清水不除草对照相比，两种除草剂处理下的糜子产量分别高193．6％、186．4％；与2，4-D丁酯乳油相比，二甲四氯钠盐可湿性粉剂对糜子田阔叶杂草的平均株防效较高，地上部积累干物质较多，叶绿素和单株绿叶面积较大，最终获得较高的产量。因此，二甲四氯钠盐可湿性粉剂对糜子田阔叶杂草的防除效果较优于2，4-D丁酯乳油。

Spraying water without weeding was used as control, the control effect of 56%methoxone, 72% 2,4-D and manual weeding on weed during 4 or 5 leaf stage of broomcorn millet were studied to screening suitable herbicide for broomcorn millet field. The results showed that methoxone and 2,4 D had control effect on broad leaf weeds with the efficiency of 69.33% and 39.62% respectively. Com- pared with manual weeding, the yield of broomcorn millet under methoxone and 2,4 D decreased by 10.27% and 12. 470/00 respectively. However, compared with the control, the yield of broomcorn mil let under methoxone and 2,4-D increased by 193.6% and 186.4%respectively. Moreover, compared with 2,4-D, methoxone had higher efficiency to control broad leaf weeds, more dry matter accumula tion, high chlorophyll content and leaf areas per plant, which resulted in higher grain yield. In con- clusion, the control effect of methoxone on broadleaf weeds was better than 2,4-D in broomcorn millet field.