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Why does the grafted plum tree only blossom and not bear fruit for several years? The fruit tree has been four years old, and there are still one or two plums.
Flowering without fruit has the following reasons:

(1) All plants are of the same variety, and there is no pollinated variety. Most plums don't bear fruit by themselves.

(2) Natural disasters, freezing injury during or before flowering.

(3) Malnutrition and incomplete flower bud development lead to pistil degeneration.

Generally speaking, apricot trees cannot be used as pollination trees for plums. Because plums are very strict with pollination trees. Not all varieties can be used as pollination trees.

The following measures can be taken to promote results:

(1) Prune reasonably and adjust the tree potential. The main reason why plums do not bear fruit is that excessive pruning leads to excessive growth. Therefore, light shear and slow release are adopted during pruning. Except that the main branches and lateral branches are well cultivated according to the requirements of plastic surgery, and some branches are dense, all the other branches are reserved for scattering. By pulling branches in winter, twisting branches in summer and leveling branches, the angle of main branches is increased to 60 ~ 70, and that of auxiliary branches is 80 ~ 90. In the growing season, when the top of the back grows to about 20 cm, it will pick the heart and promote branching. Girdling the larger main branches and auxiliary branches. The girdling is carried out at noon on sunny days, and the girdling width is generally 65438+ 0/8 of the branch diameter.

(2) Control fertilizer and water, slow down the trend and promote flowers. Except for two irrigation before freezing germination, as long as the leaves do not wither, the drainage will be timely in rainy season. In order to prevent vigorous growth and promote flower bud differentiation, fertilization should avoid the vigorous growth period of new shoots, topdressing after the new shoots stop growing, applying more fertilizer during the autumn shoot stop period (from the end of August to the beginning of September) and applying less fertilizer during the spring shoot stop period (from mid-June), increasing the amount of phosphorus and potassium fertilizer and reducing the amount of nitrogen fertilizer. Generally, 80kg soil mixed fertilizer is applied to each plant in late September, 0.5kg urea is applied to each plant in early June, and NPK compound fertilizer 1 kg is applied to each plant in late August. Spraying 0.3~0.5% urea and 0.2 ~ 0.5% potassium dihydrogen phosphate in combination with pest control in spring, spraying 1 time every1day, 3 ~ 5 times each time. In addition, spraying borax 1 time and artificial pollination at flowering stage have obvious effects on improving fruit setting rate. For reference.