小麦是否倒伏,早期可以从两个方面来观察诊断:一是从密度上看,密度过大,田间郁蔽,茎秆生长软弱,是造成倒伏的重要原因。凡每667平方米总苗数在冬季多于60万、春季超过80万的麦田,后期将会发生倒伏。二是从长势上看,在密度适宜或偏大的情况下,叶片肥大披垂,叶色墨绿,尤其是顶部第一、二片叶的 Wheat is lodging, early diagnosis can be observed from two aspects: First, from the density point of view, the density is too large, field Yu Yu, stalk growth is weak, is an important reason for lodging. Where the total number of seedlings per 667 square meters in winter more than 600,000, more than 800,000 spring wheat fields, the late will occur lodging. Second, from the growth point of view, in the case of appropriate density or large, leaf hypertrophy drape, leaf color dark green, especially the top of the first two leaves