Nitrogen is a component of protein and nucleic acid. The nitrogen content in protein is 16% ~ 18%. Protein is the basic substance of fruit tree cell protoplasm. Protein and nucleic acid are the basis of all plant growth, development and life activities. The combination of nucleic acid and protein is called nucleoprotein.

Nitrogen is also the main component of chlorophyll, enzymes, vitamins and lecithin, which can promote the synthesis of gibberellin. It can be seen that nitrogen is not only a nutrient element, but also has the function of regulating hormones, which plays an extremely important role in maintaining life activities, increasing fruit yield and improving product quality.