Foliar fertilizer should be sprayed during the flowering period to promote nutrient absorption and flower bud differentiation. It is recommended to spray potassium dihydrogen phosphate, urea, etc., as well as root fertilizers, mainly diamine and urea. According to the age of each tree, spray 0.3-0.5 kg.
The main purpose of topping is to concentrate all nutrition on the flower. During the flowering period of winter jujube, the temperature is relatively high. After the carapace is opened, the nutrition of the above-ground part is intercepted. The jujube heads, secondary branches, lignified jujube hanging, and sprouting tillers at the base grow vigorously, which not only consumes the nutrients of the tree, but also is not conducive to the prevention and control of diseases and insect pests. Therefore, the new jujube heads should be removed in time, the sprouting tillers at the base should be cut off, and the secondary branches and wooded jujube hanging should be topped. After 5 to 7 second shoots of newly released jujubes are short-cut and updated in spring, they should be topped in time to control their growth.
The most suitable period for timely girdling is the blooming period. Don't gird it too early, and gird it when the flowering reaches more than 30%. The girdling width should be determined according to the age and vigor of the tree, and is generally controlled at 3-8 mm. The girdling width can be determined according to your own experience and habits. The purpose of girdling is to retain nutrients and allow them to flow back to the roots of the tree to promote the reproductive growth of flower buds and increase the fruit setting rate.
Pest prevention and control methods
A. lucorum lives through the winter with its eggs in the cut stumps and skin crevices. The peak of damage is concentrated in the budding period, the flowering period of the jujube tree from early to mid-May to mid-June, the young fruit period and the mature period of jujube fruit. It is necessary to grasp these three peaks for comprehensive prevention and control in order to achieve the best results.
The gray spot borer is commonly known as the jujube beetle, and the larvae overwinter near the beetle. It can be started 3 days after the jujube tree is opened, with 48% chlorpyrifos 400 times liquid or armor treasure, spray or smear once every 10 days, and control it for 3 consecutive times.
Dry rot can be sprayed with 10% Shigao Water Dispersible Granules 2000 times or 30% Tebuconazole 3000～4000 times, and azole products can also be applied.
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