冬前麦田化学除草,时间紧迫,技术要求严格,稍有疏忽,不仅达不到除草效果,而且还会产生药害,提高麦田冬前化除效果应注意以下4个方面。 (一)施药要及时,麦苗和杂草在不同的生育期耐药性不同,喷施除草剂后对杂草的防效和麦苗的安全性也就不同。要在麦苗耐药力强的生育期内,选择杂草对药剂最敏感的时期用药,确保麦苗不发生药害,又能充分发?药效。一般冬前禾本科杂草,应在麦苗1.5～2.5叶期、杂草立针至2叶期施药;防除双 Winter wheat weed before the chemical weeding, time constraints, strict technical requirements, a slight neglect, not only failed to achieve weeding effect, but also produce phytotoxicity and improve winter wheat before removing effect should pay attention to the following four aspects. (A) spraying should be promptly, wheat seedlings and weeds in different growth stages of different resistance after spraying herbicides on weed control and wheat seedling safety will be different. To strong resistance in the wheat seedling growth period, the choice of weeds most sensitive period of medication, to ensure that wheat seedlings do not occur phytotoxicity, but also fully hair? Generally before winter grass weeds, should be 1.5 to 2.5 leaf stage wheat seedlings, weeds legislation to 2 leaves spraying; control double