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一、麦田化学除草的必要性和好处看麦娘、牛繁缕、碎米荠、雀舌草四种杂草占麦田总草量84.6～100％。从化学除草角度来划分冬前麦田杂草类型:以看麦娘、碎米荠为主田;以牛繁缕、雀舌草为主田。嘉善县农科所1981年试验,每平方尺看麦娘8、17.6、24.5株分别比无草区减产4.6、9.7、17.4％,一般麦田杂草数均高于此数。仅以轻草田为例,每平方尺杂草25～29株的六丘田,化学除草后也能增产4.6～19.7％。撒播麦田无法人工除草,因此化学除草成为灭草
First, the necessity and benefits of wheat field chemical weed control Anemarrhena, Niu Zhiran, chestnut chestnuts, the four species of weeping weeds accounted for 84.6 to 100% of the total grasses. Weed division from the perspective of chemical weed before weed types of wheat fields: to see Amanita, chestnut-based water chestnuts; In 1981, Jiashan County Institute of Agricultural Science tested 8,1 6,24.5 plants per square foot of Atractylodes macrophyllus reduced by 4.6, 9.7, and 17.4% respectively compared with that in the grassless area. The average number of weeds in wheat fields was higher than this number. Only light grass field, for example, 25-29 per square foot of weeds Liu Qiu Tian, chemical weeding can also increase 4.6 to 19.7%. Sowing wheat fields can not be artificially weeded by the weeds, thus chemical weeding has become weed control