High temperature and rain in summer are beneficial to the growth of various crops. And it is sunny enough for the photosynthesis of the leaves. The carbohydrates produced by crop photosynthesis require large amounts of nitrogen to form amino acids, proteins and nucleic acids. In summer, the vegetative growth and reproductive growth of crops are growing vigorously. In the fast-growing stage, the demand for nutrients, especially nitrogen and potassium, is large. Therefore, top dressing is needed.
The field crops are mainly topdressing nitrogenous fertilizers, and economic crops such as vegetables, grapes, and cotton. In addition to nitrogen fertilizers, potassium fertilizers are also topdressed. For example, the spring corn crop is treated with urea single-use basal fertilizer as a reference, and the other half of urea is topdressed and applied at the end of July and early August. The latter can increase nitrogen utilization by 10 to 20 percentage points. This shows that the utilization rate of nitrogen fertilizer application is significantly higher than that of all nitrogen fertilizers as the base fertilizer application method. With regard to the methods of nitrogen and potassium fertilizers applied in the summer, they must be ditched and covered to avoid the loss of nitrogen volatilization caused by the application of nitrogen fertilizers and the fixation of potassium by potassium on the surface.
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