Nitrogen is the main component of the nutrient required by the apple tree, and is the main component of organic compounds such as protein, chlorophyll, vitamins, hormones, nucleic acids, and enzymes. The profit and loss of nitrogen nutrition in apple trees is the basis for fertilizing apple trees. One. However, there is a certain limit to the nitrogen requirement of apple trees, and in the annual growth cycle, the time and amount of nitrogen fertilizer application affect the fertilization effect. If the supply of nitrogen is too much or insufficient, it will not only affect the yield and quality of apples, but also cause the tree to grow vigorously or weakly.

The nitrogen nutrition status of apple trees is different, and the external morphological characteristics of the trees are obviously different. Applying nitrogen fertilizer in apple tree cultivation and management, tree growth performance is one of the basis for fertilization.

During the annual growth cycle of the Wangchang apple tree, the branches in the crown have a high proportion of long branches, and the new shoots of the branches are large in growth and mostly show secondary growth; the tree has long branches, the buds are not full and the quality is poor, and the autumn leaves are large. For such flourishing trees, special attention should be paid to controlling the application of nitrogen fertilizer and watering when the spring shoots stop growing.

In the annual growth cycle of this type of tree, the growth of the tree body is slow, the new shoots are thin and short, the leaves stand up and sparse, the leaves are yellow and brittle, and the top buds of the branches grow many times. This kind of growing tree, It is a manifestation of weak growth. Nitrogen fertilizer should be applied to such trees before and after budding, after flowering and in autumn.

Trees with stable yields Trees with stable yields. The vegetative branches and short fruiting branches on the tree grow stoutly, accounting for a moderate proportion of the long, medium and short branches; the growth of various organs is coordinated, the leaves are large and neat, and the leaves are green. Fertilize this kind of trees, don't apply nitrogen fertilizer alone, use special fertilizer for fruit trees.

Note 1. In the late growth period of the tree, high nitrogen content in the soil is unfavorable for fruit coloring. During the period from May to June, if too much nitrogen is applied, the fruit color will be poor in the later period; during the period before fruit picking, the application of nitrogen fertilizer should be controlled; after the summer, more potassium fertilizers should be applied, and phosphate and potassium fertilizers should be used together. 2. For fruit trees with striping phenomenon, the time of applying nitrogen fertilizer should mainly be in the early stage of the annual growth cycle, and the application of nitrogen fertilizer should be appropriately reduced in the later period, which is beneficial to prevent the phenomenon of fruit tree striping. 3. Applying nitrogen fertilizer before deciduous fruit trees can quickly increase leaf nitrogen nutrition in a short period of time, and can improve the effect of storage nutrition.

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