How to fertilize apple trees

Fertilization is generally divided into two types: fertilizer storage and topdressing, and the specific time depends on the variety, fertilizer demand law and tree growth results. Under normal circumstances, it is advisable to apply fertilizer four times a year:

1, pre-flowering fertilizer or germination fertilizer (early April).

2. Fertilization after flowering (mid-May). These two fertilizations can effectively promote germination and flowering, prevent fertilization in time because flowering consumes a lot of nutrients, improve fruit setting rate and promote the growth of new branches.

3. Flower bud differentiation and young fruit expansion period (from the end of May to the beginning of June). This topdressing is to meet the needs of fruit expansion, branch growth and flower bud differentiation. This time, potash fertilizer is the main fertilizer.

4. Autumn is the best time to apply accumulated fertilizer (mid-September). When farmyard manure is the main fertilizer, all phosphorus is applied according to the total amount of the whole year. In order to give full play to fertilizer efficiency, phosphate fertilizer should be accumulated and decomposed with organic fertilizer before mixed application.

The pruning method of extended data apple trees is as follows:

1. If the apple tree grows too vigorously, the growth of branches is dominant, which is not conducive to the formation of flower buds. When pruning, "slow branches" are the main measures, such as increasing the branch angle of the main branches, thinning the upper branches on the back, leaving more lateral branches and lower branches, extending the branch length, and taking measures such as ring cutting to control the transport of nutrients and promote flowering.

2. If the apple tree is too weak, it can be pruned on the basis of fertilizer and water management to stimulate vigorous growth. Extension branches should be cut in the middle full of buds, with strong branches as the guide, and gradually increase the extension angle, leaving fewer branches on the back and more branches on the back and sides.

3. If the apple tree has big branches on one side and small branches on the other, and the crown of the tree grows slightly, firstly, the branches are thinned at the lower part of the branches, and the flowers are thinned at the upper part of the small branches; The second is to widen the branch angle and raise the branch angle; Third, large branches leave more fruits, while small branches leave less fruits; Fourth, apply less fertilizer in the direction of big branches and more fertilizer in the direction of small branches. It is strictly forbidden to transform trees by chopping.

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