Chemical Control of Weeds at Seedling Stage of Spring-seeded Alfalfa in the Western Part of Heilongjiang
Aiming at the current situation of serious weed damage during the seedling stage of spring-seeded alfalfa in Heilongjiang Province,a one-way randomized group design was adopted to study the effects of 13 herbicide combination treatments on weed prevention and removal in spring-seeded alfalfa fields.The results showed that:the four treatments of Haloxytop-R-mithyl、Quizalofop-p-ethyl、Sethoxydim and Bentazone+Quizalofop-p-ethyl were effective in preventing monocotyledonous weeds,with the strain preventive effect greater than 94.49%;the treatments of Imazethapyr+Bentazone、MCPA-Na、Bentazone and Metribuzin were effective in preventing broadleaf weeds,but MCPA-Na and Metribuzin had serious chemical damage to clover and could not be used in the production;Imazethapyr+Bentazone,Imazethapyr,Imazethapyr+Quizalofop-p-ethyl,Imazethapyr+Sethoxydim are the best in preventing weeds with fresh weight,which were 76.44%～84.08%.Considering the control effect and fresh weight control effect as well as the occurrence of weed in this region,the combination of Imazethapyr+Bentazone had better effect,which can be promoted and utilized in the field production process of alfalfa in the western Heilongjiang Province.
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