In recent years, fruit tree production often has the phenomenon of more flowering, less fruit setting, and poor economic benefits. Analysis of the reasons is that in addition to the large amount of pruning and remaining branches, which causes poor scenery conditions, the main reason is that the base fertilizer is not applied on time and in sufficient quantities. , Resulting in low nutrient levels of fruit trees, resulting in low fruit setting rate. From this point of view, applying basal fertilizer in autumn and increasing the nutrient level of fruit trees are the basis for high yield and high quality.

Organic fertilizers are used as base fertilizers, including commercial organic fertilizers, farm fertilizers, cow manure, sheep manure, chicken manure, etc. These fertilizers contain relatively complete nutrient elements (such as nitrogen, phosphorus, potassium, sulfur, calcium, magnesium, zinc, In addition to iron, manganese, boron, copper, etc.), the main feature is that it contains a lot of organic matter, which can not only basically meet the needs of fruit trees for various nutrients, but also improve the soil, enhance soil fertility, and improve fruit quality.

The basal fertilizer is applied in autumn as the best method, and it is generally controlled about 1 month before the leaves of fruit trees. At this time, it is the third peak period of fruit tree root growth. Fertilization of damaged roots is easy to heal and can promote a large number of new roots; in addition, fertilizer is easy to decompose, which is conducive to root absorption. During this period, some of the aboveground organs of the fruit trees have gradually stopped growing, and the newly absorbed nutrients by the roots are mainly accumulated and stored, which can increase the nutrient level of the tree and enhance the cold resistance. The reserve nutrients of fruit trees play a great role in the annual cycle of fruit trees. It has a direct impact on the germination, flowering, fruit setting, leaf development and rooting of the tree through winter and the following spring. The size of the fruit depends on the number of cells and the size of the cell volume, and the number of cells depends on the level of reserve nutrients. Therefore, if the tree body has insufficient nutrients, the fruit is prone to grow long and crooked, becoming "crooked jujube". When organic fertilizer is applied, it is combined with some quick-acting fertilizers (such as nitrogen, phosphorus, potassium, zinc, iron, magnesium fertilizers, etc.) to improve tree resistance and improve flower bud quality.

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