It is hot and rainy in summer, which is conducive to the growth of various crops. Moreover sunny, favorable to photosynthesis. Carbohydrates produced by crop photosynthesis require large amounts of nitrogen to form amino acids, proteins and nucleic acids. For wheat, corn and rice and other food crops, the summer crop nutrition growth and reproductive growth of alternating strong growing season, crop growth stage quickly, especially large demand for nutrients nitrogen and potassium, so the need for top dressing.
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Field crops are mainly applied to nitrogen fertilizer, and economic crops such as vegetables, tobacco, grapes, cotton, etc., in addition to nitrogen fertilizers, should be applied to potash fertilizer.
For example, spring corn crops are treated with urea one-time base fertilizer as a reference, and the other half of the urea is used as a top dressing, which is applied at the end of July and early August. The latter's nitrogen fertilizer utilization rate can be increased by 10 to 20 percentage points. This description is applied to recover nitrogen utilization was significantly higher than all of the nitrogen fertilizer base fertilizer application methods. Regarding the method of applying nitrogen and potassium fertilizer in summer, it is necessary to ditch the soil to avoid the loss of nitrogen volatilization caused by nitrogen application and the potassium fixation caused by the alternating dry and wet of potassium fertilizer on the surface .
However, it should be noted that the application of nitrogen and potassium fertilizer should cover the soil to avoid nitrogen loss during the hot and rainy season.
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