湿润直播稻田杂草的一次性化学防除技术的研究

扫特处理提供了优良的杂草鲜重防效和最高水稻产量 ,扫特是湿润直播稻田早期使用的最佳除草剂。丁苄对杂草的鲜重防效和水稻产量水平不亚于扫特 ,其配套技术是 :在水稻 1叶 1心期使用 ,用药时排干田水保持土壤湿润状态。二氯苄是直播稻田中期茎叶处理剂 ,最佳使用时间在水稻 2叶 1心期 ,排干田水后喷施。扁秆草的防效尚有待于提高

Study on One-shoot Chemical Control of Weeds in Wet Direct-seeding R ice Field

The experiment in herbicide-Sofit treatment showed the Sofit was the best herbicide for earlier use in wet direct-seeding rice in the control of weed and the obtainment of high rice yield. Butachlor + Bensulfuron methyle gave as good as the Sofit treatment in the weed control and rice grain yield. Quinclorac + Bensulfuron methyle (QB) was a combined herbicide that may be suitable for the application as a post-emergence treatment. The best date of QB application was at the date of two-leaf-one-heart of rice plant, draining off water in paddy, then spraying the herbicides. The control of Scirpus planiculmis should be improved by screening new active herbicide.