安徽省淮河以南麦区小麦冬季无明显越冬期，冬季气温高，雨水较充沛。前期施用的速效化肥，经过冬季已消耗殆尽，而春季正是植株需要大量养分的关键时期，若不及时补充肥料，会导致麦苗返青迟，生长缓慢，叶片狭窄，叶色淡黄，功能期缩短，分蘖出生少，根系少而长，根毛不多，? Wheat in the southern wheat of Huaihe River in Anhui Province had no obvious wintering in winter, and had high winter temperatures and plenty of rainwater. Quick-acting chemical fertilizers applied in the early stage have been depleted in winter and spring is a critical period for plants to require large amounts of nutrients. Failure to replenish fertilizers in a timely manner will result in late retreat of young plants, slow growth, narrow leaves and pale yellow leaves, Shortened, fewer tillers, roots less and longer, root hair is not much ,?