Which fertilizers are mainly applied in summer

The field crops are mainly topdressing nitrogenous fertilizers, and economic crops such as vegetables, tobacco, grapes, and cotton. In addition to nitrogen fertilizers, topdressing potassium fertilizers are also used. 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 beginning of July and early August. The latter can increase nitrogen utilization by 10-20 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 on the surface caused by alternation of dryness and humidity.

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