倒伏是影响小麦高产、稳产、优质的重要因素之一。小麦倒伏主要发生在肥水充足、小麦旺长、群体过大、田间郁蔽的高产麦田。早春是预防小麦倒伏的关键时期。小麦抽穗前倒伏可减产30%~40%,灌浆期倒伏减产20%~30%,乳熟期倒伏减产10%左右,倒伏严重时减产可达50%以上。一、发生症状分茎倒伏和根倒伏两类。 Lodging is one of the important factors that affect wheat high yield, stable yield and high quality. The lodging of wheat occurs mainly in high-yielding wheat fields where fertilizer and water are plentiful, wheat is flourishing, the population is too large, and the fields are stagnant. Early spring is a crucial period to prevent wheat lodging. Wheat heading lodging can be reduced by 30% to 40%, grain filling lodging 20% ​​to 30% reduction, milking lodging 10% less yield, lodging severe up to 50% or more. First, the symptoms of stem lodging and lodging two types of roots.