不同除草剂对糜子田杂草的防除效果

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。

Control Effect of Different Herbicides on Weed in Broomcorn Millet Field

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. Compared with manual weeding, the yield of broomcorn millet under methoxone and 2,4 D decreased by 10.27% and 12.47% respectively. However, compared with the control, the yield of broomcorn millet 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 accumulation, high chlorophyll content and leaf areas per plant, which resulted in higher grain yield. In conclusion, the control effect of methoxone on broadleaf weeds was better than 2,4 D in broomcorn millet field.