Five technical points of chestnut management in May
Chestnut in May is at the flowering stage, and the new shoots grow vigorously. Cultivation management should combine its growth characteristics and physiological needs, try its best to control vegetative growth, promote reproductive growth, ensure good flowers and strong fruits, and improve the quality of fruit consumption and increase the commercial value of fruits Lay the foundation. The management points are as follows:
One is top dressing to supplement nutrition. Spraying 0.3% borax + 0.3% urea solution during flowering can improve fruit setting rate. After flowering, chemical fertilizers are applied topically, mainly nitrogen fertilizer and boron fertilizer. Generally, big trees apply urea 2.5-5 kg ​​/ plant, and young trees apply urea 0.25 kg / plant. The amount of boron fertilizer applied is calculated based on the projected area of ​​the canopy of 15 g / m2, and excessive application is likely to cause fertilizer damage. Water should be irrigated in a timely manner after fertilization. If there is no irrigation condition, hole storage water technology can be used. At the young fruit stage, topdressing with phosphorus and potassium fertilizers.
The second is to de-maleize to retain nutrition. When the male flowers grow to 3 to 5 centimeters, spray 1,000 to 1300 times of sparse androgenol to remove excess male flowers and save nutrients for fruit setting. Generally, each vial is sprayed with 13 kg of water for foliar application, which should be even and meticulous.
The third is summer trimming. Open the light by sparse branches, remove the long branches, dense branches, and thin branches in the crown of the tree, increase the light in the bore of the tree; remove the heart and promote flowering, and leave the branch with 1 to 3 leaves at the front of the fruit for topping, and the male flower branch from the 10th to Topping at 20 leaves, and developing branches topping from 13 to 18 leaves.
The fourth is pest control. Insect pests should focus on controlling chestnut aphids, red spiders, chestnut borer wheat moths, boat-shaped caterpillars, swing caterpillars, etc. The spraying agent should be selected from 2000 to 3000 times of imidacloprid, 1600 to 2000 times of nisolan, and 4.8% tadolin 1000 to 1500 times solution, high-efficiency cyhalothrin 3000 times solution. Diseases should focus on the prevention and treatment of ring streaks and rots. The spraying agent should be Dupont Fuxing 8000 ～ 10000 times solution, or wheel pattern 1 800 times solution.
Fifth, plowing the soil and pressing green manure. Before the rainy season, plowing and mulching grass can improve root growth environment, increase soil organic matter content, and improve soil permeability.
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