0. 1% borax and 0. 1% group acid are mixed and sprayed. When spraying medicine, the medicine should be sprayed evenly on the flowers until the water drops fall. Spraying leaves with mixed solution of 0.3% urea solution and 0.4% potassium dihydrogen phosphate solution at full flowering stage and young fruit stage. Spraying growth regulators and trace elements; Spraying gibberellin or 2% chlormequat chloride solution and 0.2% zinc sulfate solution with the concentration of 10× 10-4 at flowering stage.
Flowering and girdling plum trees with the age of 12 ~ 15, which have entered the full fruiting stage, are girdled at the full flowering stage. The girdling is carried out once a year. The girdling starts from the base of the trunk and gradually rises at intervals of 3-5 cm. The principle of three no-stripping should be mastered in girdling, that is, young trees should not be stripped and weak trees should not be stripped until girdling period.
Introduction of maintenance methods in flowering period of plums;
1, rational topdressing
Fertilize plum trees before and after flowering, and apply fruit swelling fertilizer in time. Note that its root system is shallow, and topdressing should be carried out according to watering amount, tree potential, tree age and soil quality.
2. Pollination at flowering stage
Plum seeds can be pollinated by artificial point pollination, liquid spraying and hair dryer at flowering stage, or by bees in orchard. A box of bees can ensure pollination in one hectare of orchard.
3, thinning flowers and fruits
Plum trees have a large amount of flowers, and proper thinning of flowers and fruits can reduce nutrient consumption. Flower thinning is generally carried out after the full flowering period. First, remove the flowers at the base of the fruiting branches, leaving the flowers in the middle and upper parts. Fruit thinning should be carried out one or two weeks after flowering, from top to bottom and from inside to outside.