How to apply nitrogen fertilizer to fruit trees

Too much nitrogen in the fruit tree can lead to loss of balance between carbohydrates and nitrogen in the tree or misalignment with other elements, resulting in excessive growth of nutrients, excessive foliage, poor flower bud differentiation, serious flowering and falling fruit, and summer and fall fruit. When the nitrogen content in the leaves exceeds 2.5% to 3.0%, fruit ripening is postponed, the fruit coloring is poor, and the fruit quality is coarse; the sugar content and the fruit hardness are reduced, and storage is not tolerated, physiological diseases are numerous, and the wintering ability of the tree is reduced.

The lack of nitrogen nutrition in fruit trees will affect the photosynthesis and protein formation of fruit trees. The growth of spring shoots in trees will be slow, the growth of branches will be thin, and the thin and light leaves will cause yellowing of old leaves at the base of shoots and early fall of leaves in autumn. A lot of fruit drop. In the absence of nitrogen, the flowers are small, the fruit setting rate is low, and the fruits are light in color. Long-term nitrogen deficiency will reduce the stress resistance of the fruit tree, and the tree life is short.

Fertilization of fruit trees should pay attention to maintaining the balance and coordination of various nutrients. A variety of nutrients have promotion and restraint among each other, such as phosphorus deficiency will affect the metabolism of nitrogenous substances; potassium and nitrogen absorption and protein synthesis have a certain relationship, the application of nitrogen fertilizer, phosphorus and potash fertilizer simultaneously, good fertilizer effect .

Topdressing nitrogen fertilizer outside the root has a significant effect. Applying nitrogen fertilizer out of the roots of fruit trees before germination can improve leaf quality and increase photosynthetic intensity. Spraying 0.3% urea on the leaves during flowering has a good effect on improving fruit setting rate. Spraying high-concentration urea into the leaves in late autumn can increase the storage nutrition and benefit the growth and development of fruit trees. In the 2 to 4 weeks after the fruit is harvested and before defoliation, spraying urea on the leaves will not only help the growth and development of the tree in the following year, but also increase the amount of flowering, and it will also increase the fruit setting rate, so that the tree yield will be of high quality. Therefore, we must pay attention to topdressing nitrogen fertilizer in late autumn.

Determination of the amount of nitrogen fertilizer: Due to the different growth periods of trees and different tree vigor, the amount of nitrogen fertilizer needs to be different. Determine the amount of fertilizer to be used according to tree vigor, adjust the ratio of nitrogen and phosphorus, potassium, determine the amount of nitrogen fertilizer.

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