After the wheat rainstorm, it is caused by climatic factors, improper cultivation measures and improper fertilization. At the end of wheat grouting, if it rains, accompanied by gusts or strong winds, wheat may lodging in a large area; Improper cultivation measures: excessive sowing amount, topdressing and watering at the turning green stage and rising stage will lead to elongation of basal internodes and weakening lodging resistance. In production, all high-yield farmland irrigated with wheat yellow water in late May will be stranded to varying degrees after encountering the wind; Reasons for fertilization: Improper fertilization can easily lead to lodging. There are two aspects: the proportion of nitrogen, phosphorus and potassium is unreasonable when applying base fertilizer, and only nitrogen and phosphorus are paid attention to, while potassium fertilizer and trace fertilizer are ignored; Excessive nitrogen topdressing or improper topdressing period.
In the later stage of wheat growth, if some or most lodging occurs, the transportation of water and nutrients in wheat will be blocked, which will seriously affect the maturity of wheat, reduce the 1000-grain weight and lead to a decline in yield. The earlier lodging, the greater the impact on yield. For example, lodging at heading stage can reduce yield by 30%-50%, and lodging at filling stage can generally reduce yield by about 20%.
Correct first aid measures after lodging of wheat: Do not straighten the lodging wheat artificially after lodging; When wheat lodging, foliar fertilization should be done in time. After lodging, the stress resistance of wheat plants decreased. Foliar fertilizer should be sprayed in time to supplement nutrition, enhance the stress resistance of wheat plants, extend the filling time and stabilize the grain weight of wheat; The prevention and control of wheat diseases should be strengthened after lodging; Wheat lodging seems to be caused by strong wind and heavy rain. However, the root cause is too much sowing. Secondly, the temperature is too high, the wheat field is lush and the lodging resistance of wheat is weakened.
Measures to prevent lodging of wheat: select lodging-resistant varieties; The planting density is reasonable; Scientific fertilization: the balance between base fertilizer and topdressing is reasonable; Scientific control: for wheat fields with high straw content, large sowing amount and early sowing, chemical control should be carried out in time during the turning green period of wheat; Early control of wheat sheath blight: sheath blight is also an important factor causing wheat lodging.
Don't just sigh and complain after wheat lodging. Doing a good job of restoring wheat after lodging can restore some losses to a certain extent and not stop production.