小麦苗期生长健壮是丰产的基础。但是,在这一阶段如因营养缺乏、管理不善,或不良的外界环境条件的影响,小麦生长发育受阻,往往出现黄苗、红苗、紫苗等麦苗色变现象。引起麦苗变色的原因很多,但只要摸清原因,对症下药,就能收到良好的防治效果,现就多年来的实践总结如下:1.缺氮型 The robust growth of wheat seedling is the basis of high yield. However, at this stage, due to lack of nutrition, poor management, or poor external environmental conditions, wheat growth and development are blocked, often appear yellow seedling, red seedling, purple seedling and other wheat seedling discoloration. Cause wheat seedling discoloration for many reasons, but as long as find out the reason, the right medicine, you can receive good control effect, now the practice over the years summarized as follows: 1. Nitrogen-deficient