How to apply nitrogen fertilizer to fruit trees

Nitrogen is a component of protein, the basis of production, and the material basis for yield formation. The fruit has low nitrogen content, although it can form flowers, but the fruit setting rate is low, the fruit is small, the fruit color is poor, and the yield is low. Long-term nitrogen deficiency can lead to weakening of fruit trees and shortening of life; fruit trees have high nitrogen content, although fruit Large, but the branches and leaves are long, the flower buds are poorly differentiated, and the falling flowers are seriously. If the nitrogen content in the leaves of the fruit trees in summer and autumn exceeds 2.5%, the fruits are delayed in maturity, the coloration is poor, the meat is thick, the sugar content and hardness are reduced, and the storage is not resistant. There are many diseases and it is not suitable for safe wintering.

Nitrogen is required during the rainy season. In the rainy season from June to July, especially in orchards with poor fertility, nitrogen fertilizers are severely leached with rainfall, which may cause nitrogen deficiency and premature aging or early decline of functional leaves. Therefore, the supply of nitrogen fertilizer in the rainy season should be guaranteed.

Applying nitrogen fertilizer in spring is not effective for flowering and fruit setting in the same year. Nitrogen is generally in the form of nitrate nitrogen and ammonium nitrogen. After the ammonium nitrogen and nitrate nitrogen enter the fruit tree, they are converted into nitrogen dioxide, which is combined with carbohydrate to form amino acids, which are stored in the tree. Although the timing of this conversion process is not clear, it certainly takes a long time. Fruit tree flowering and fruit setting require nitrogen in the form of amino acids already stored in the tree. Therefore, the nitrogen supplementation of fruit trees should be applied to the base fertilizer in the autumn (from late August to early September, mainly organic fertilizer, combined with phosphorus and potassium fertilizer). After harvesting, apply nitrogen fertilizer or foliar spray 1 or 2 times of high-concentration nitrogen fertilizer. (in the principle of no fat damage), and should not supplement nitrogen in spring.

Author: Yu Xin-gang
Source: Henan Science and Technology News

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