The annual budding, flowering, fruiting of apple and its growth potential and the amount of nutrients stored in apple trees for a year are closely related. If the accumulation of nutrients accumulated in the apple tree in the previous year was abundant, the quality of flowers and the fruit setting rate could be improved, and the branches and leaves could grow robustly; if less nutrients were accumulated in the previous year, the quality of flowers was poor and the fruit setting rate was low. The ability to resist pests and diseases has been severely reduced.
Basal application of the apple tree in autumn can increase tree vigor and increase the quality and fruit setting rate of apple trees in the coming year. Because of the high ground temperature in the fall, the soil moisture is also high. At this time, the fertilizer decomposes quickly in the soil. At the same time, autumn is the peak period of apple tree root growth (from late August to September). The number of roots absorbed is large, and the roots (the roots that are fertilized and injured) are easily healed. After the fertilizer application, they can be quickly absorbed by the roots of apple trees. The utilization of the apple tree greatly enhances the photosynthetic efficiency in the autumn, and the production of a large amount of organic matter is stored in the tree body, which is extremely beneficial to the growth, flowering and fruiting of the apple tree next year. The spring fertilization, due to low ground temperature, low humidity, fertilizer effect is slow, can not be timely supply of tree growth needs.
Therefore, with the same kind of fertilizer, the same amount of fertilizer, the autumn base fertilizer than the spring base fertilizer can increase the fruit setting rate of the apple tree more than 10%, and production and quality have also been significantly improved.
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