20%■唑·氯吡嘧可分散油悬浮剂对水稻直播田杂草的防效研究

Study on the Control Effect of Metamifop+Halosulfuron-Methyl 20% OD on Weeds in Direct Seeding Rice Field

为评价20%噁唑·氯吡嘧可分散油悬浮剂对水稻直播田一年生杂草的防除效果,探索其最佳使用剂量,开展了田间药效试验。结果表明,20%噁唑·氯吡嘧可分散油悬浮剂对水稻直播田杂草的株防效与施药剂量呈正相关性,施药后15 d和30 d对稗草、聚穗莎草、醴肠和总草的防效分别达81.3%~100%,78.4%~99.0%,显著高于对照药剂。在水稻的苗期、杂草2~3叶期施药,使用制剂量为600~750 g/hm2条件下,20%噁唑·氯吡嘧可分散油悬浮剂不仅对稻田一年生杂草防除效果显著,并且对试验品种水稻生长安全,具有增产效果。

In order to evaluate the control effect and the optimal dose of metamifop+halosulfuron-methyl 20%OD on weeds in direct seeding rice field,field trials were carried out.The results showed that metamifop+halosulfuron-methyl 20%OD for weed control effect and the administration dose of direct sedding ricefield had positive correlation.At the 15th and 30th day after treatment,the efficacies by plant number of Echinochloa crusgalli,Cyperus imbricatus Retz.,Eclipta prostrata and total grasses were 81.3%-100%and 78.4%-99.0%,significantly higher than control.With the formulation used in an amount of 600-750 g/hm2,the seeding stage of rice,2-3 leaves stage of weed with a foliage spray,metamifop+halosulfuron-methyl 20%OD not only had significant control effect on annual weed,but also yielded high reproduction and was safe to rice.