1．苗发黄小麦过于稠密，出现争光、争水、争肥现象，因而麦苗个体瘦弱发黄。在这种情况下，要先锄掉多余的麦苗，然后及时追施及素化肥。2．苗瘦发黄播种时没有来得及施底肥或底肥不足，随后没有及时追肥，麦苗团长期饥饿而发黄。对于这样的地块，必须在冬前补施化肥，越早越 1. Wheat seedlings are too dense yellow wheat, there glory, Zhengshui, Zhengfei phenomenon, which thin and yellow wheat seedlings individual. In this case, first hoe off excess wheat seedlings, and then promptly topdressing and fertilizer. 2. Slender yellow hair seeding did not have time to apply base fertilizer or insufficient base fertilizer, then there is no timely dressing, wheat seedlings long-term hunger and yellow. For such plots, fertilizer must be replenished before winter, the earlier the more