一、麦田恶性杂草发生状况近年来,随着小麦栽培制度的变化水土流动性及机械跨区作业等方面的农业生产措施改变,小麦田恶性杂草的发生种类、密度、数量及面积越来越大,给小麦的生产带来了极大的危害。一方面,杂草与小麦争夺水分、营养、空间和阳光,致使小麦生长营养不良,分蘖偏少,造成亩穗数和千粒重不足;另一方面,严重的草害问题还会传播病虫害的问题等。这两个因素叠加起来,就加重了对小麦的危害,局部田块的产量损失 In recent years, with the wheat cultivation system changes in soil and water mobility and mechanical cross-regional operations and other aspects of agricultural production changes, the occurrence of malignant weeds in the wheat field species, density, quantity and area more and more The bigger, the wheat production has brought great harm. On the one hand, competition between weeds and wheat for water, nutrition, space and sunlight led to malnutrition in wheat growth and less tillers resulting in fewer ears per acre and less than 1000 seeds per acre; on the other hand, serious grass-pest problems could also spread pests and diseases . The combination of these two factors aggravates the harm to wheat and the production loss of local plots