Precautions for top dressing of wheat in spring
1. According to soil fertility
Different plots have different soil fertility. This can be seen from the growth of wheat. If it is a plot with good soil fertility, there is sufficient base fertilizer before wheat sowing, and organic fertilizer is applied, or In the case of soil testing and formula fertilization, the wheat grows well, and nitrogen fertilizer can be applied less in spring, generally 8-10 kg per mu. If the soil fertility status is relatively poor, the base fertilizer application is insufficient, the wheat growth is poor, and the seedlings are weak and yellow, such a plot should be fertilized more, and 20 kg of urea, calcium superphosphate and potassium chloride should be applied per mu. 8-10 kg, in order to meet the nutrient requirements of the subsequent growth of wheat.
2. Matters needing attention
When topdressing, it is recommended to choose sunny and good weather, and the time can be selected from 10 am to 4 pm. If there is a wheat field with irrigation conditions, after topdressing, it can be properly watered, do not irrigate with heavy water for a long time, and the amount of water is sufficient. For wheat fields without irrigation conditions, it is not recommended to spread fertilizers when topdressing. Deep application methods can be adopted. The depth is generally about 5-6 cm. After fertilization, remember to cover the soil in time to improve the utilization rate of fertilizers. Topdressing should not be excessive, otherwise it will have a counterproductive effect. On the one hand, it will cause fertilizer damage, and on the other hand, it will increase the cost, and it will not achieve the effect of increasing production.