Young apple trees grow stronger, but their cold resistance is poor, management is not good, and it is prone to pumping after winter. In this regard, Yan Zhihui, director of the Fengxiang County Horticultural Station in Shaanxi Province pointed out that the field management in autumn is the key to safe wintering of young apple trees, and the following prevention measures are proposed.
Do a good job of plastic surgery, pruning from early August to early October, and picking the heart, pulling the branches and taking the branches. The shoots that have not stopped growing are uniformly topped to control growth and promote nutrient accumulation. At the same time, for all kinds of branches with small angles, the branches are continued on the basis of spring and summer pull branches, generally the main branch angle is pulled to 70-80 degrees, and the feeding branches are pulled to 90-120 degrees. Pay special attention when pulling the branch. First, hold the base of the branch from the lower part with one hand, and gently pull the base with the other hand, and slowly pull down to prevent the base from splitting. The tie rope should be "song". Take the branches of the main branches, the branches on the auxiliary branches, and the long branches on the center to change their growth potential and growth direction. Method: Use a little force from the base of the branch from the inside to the outside to grip the branches, so that the branches are damaged, and the vascular bundles in the branches emit a "beep" sound, but do not break the branches, and do not damage the leaves. The branches after the take-up are horizontal or drooping.
Timely application of base fertilizer ensures that the base fertilizer is applied in early September. At this time, the damaged root wound can heal quickly after the application of the base fertilizer. The nutrient can be absorbed and utilized by the root system, which can increase the nutrient storage of the tree, and apply the farmer's fertilizer to each young tree. About 50 kg.
Spraying foliar fertilizer to promote the growth of young twigs is full, robust, early maturity, and enhance the wintering of the tree. After August, every 10 to 15 days, spray 0.3% to 0.5% potassium dihydrogen phosphate and 1000~. 2000 mg / liter of paclobutrazol, both can be sprayed at the same time, even spray three times.
Timely water cuts will not be poured into the autumn water from August to winter irrigation to promote the maturity of the branches.
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