不同除草剂用量对水稻生产的影响研究

对施用不同剂量除草剂丁草胺和农得时的稻田处理研究表明，该配方在常量和倍量下能够较好防除沈阳地区稻田杂草，药后35d对杂草株数防效和鲜重防效分别达80％和90％以上，但对水稻株高和分蘖有一定抑制作用，且杂草一定程度表现出抗性；在不施用除草剂和施用半量除草剂的情况下，杂草竞争使水稻在株高和分蘖等方面部有一定的补偿作用，但水稻产量分别下降36．01％和54．80％，主要是因为有效穗和每穗实粒数的减少；除草剂狭义经济效益良好．

Effects of different application dosage of herbicide on rice production

Investigations on the effects of different application dosage of Machete and Londax mixture to control weeds in paddy fields showed that applied common and double dosage could effectively control weeds, and the controlling effects exceeded 80% and 90%, respectively, while there were some inhibiting effects to height and branch number of rice, and some resistance of weed had appeared. Weed contest might make rice get some compensation in height and branch under the condition that no herbicide and half dosage were applied, but the rice yield was decreased 36.01% and 54.80%, respectively, mainly because of the decrease of the number of effective panicles and grain number per panicle. The narrow economic benefit of the herbicides should be high.