It doesn't matter if the jujube is harvested.

First, apply good fruit-picking fertilizer. Fruit-picking fertilizer was applied 4 days before harvest or 7 days after harvest. Each jujube tree is generally treated with organic fertilizer of 50Mel 60kg. The trench method is used to apply it to the base of the trunk of the jujube tree, and the soil is covered immediately after application.

Second, spray quick-acting fertilizer. Immediately after fruit harvest, 0.4% urea solution and 0.4% Mel 0.5% potassium dihydrogen phosphate solution were sprayed on the leaves to avoid defoliation, improve photosynthetic efficiency after fruit harvest, accumulate and increase tree nutrition, promote flower bud differentiation, and reduce flower and fruit drop in the coming year.

Third, fertilize and cultivate the soil. In winter, the soil should be cultivated within 1 meter of the crown radius, which is about 17muri 33cm thick, which can enhance the ability to resist drought and preserve soil moisture and fertilizer. For the jujube orchard with barren soil, lack of organic matter and shallow tillage layer, we can dig deep trenches and press fertilizer to improve the soil, so as to deepen the tillage layer, increase soil porosity and improve fertility. 3000 kilograms of organic fertilizer per mu.

Fourth, pruning. Winter pruning is generally carried out after the fallen leaves of jujube trees, mainly to remove dry and withered branches, disease and insect branches, overlapping branches, slender branches, long branches and senescent branches and so on. Winter shears should pay attention to keep the extended branches of all levels of backbone branches, the cut mouth is smooth, do not hurt the tree.

Fifth, apply good overwintering fertilizer. Applying winter fertilizer once before overwintering lays a good foundation for promoting growth and increasing yield in the coming year. Ring ditch application is generally adopted, that is, trenches are dug along the vertical line along the edge of the crown, with a depth of 20ml / 30cm and a width of 30cm. Each plant is applied with rotten pig and cow manure of 50kg or compost of 100kg, calcium superphosphate of 3kg, potassium chloride of 1kg, human and animal manure of 1kg, and cover the soil in time after application.

Sixth, prevention and control of diseases and insect pests. Combined with winter soil ploughing, collecting overwintering insects in the soil under the burning trees, the larvae can irrigate 5% phoxim 500 times solution on the ground before being unearthed, or sprinkle 2.5% methyl parathion powder about 100 grams to kill the larvae. To control the jujube armyworm, measures can be taken to seal the tree hole, scrape off the old bark and dig the tree plate to eliminate the overwintering pupae so as to reduce the harm in the coming year.