黄苗、座苗是我县春小麦生产中的一个突出问题。近年来不少社、队的春小麦田灌水后出现黄苗、座苗,造成严重减产。我们从1976年起进行了三年的调查研究。一、外部症状和生理原因通过多年的观察、分析,黄苗、座苗在头水前后有其不同的外部症状: 黄苗头水前,叶色浅绿,绿中透黄,生长势弱, Yellow seedlings, seat seedlings are my county spring wheat production in a prominent issue. In recent years, many clubs, the team’s spring wheat fields appear yellow seedlings, seedlings, resulting in serious cuts. We have conducted a three-year investigation since 1976. First, the external symptoms and physiological reasons After many years of observation and analysis, yellow seedlings, seedlings have different external symptoms before and after the head-water: yellow seedlings before the water color green leaves, green, yellow, weak growth,