1. Cultivate strong autumn shoots. The autumn shoot is the result of the longan in the coming year, and it is also one of the main shoots of the longan wintering. Whether the autumn shoot is strong or not affects its wintering and cold resistance. Therefore, the last autumn shoots of the longan are generally controlled to be released in the middle and late October. It is best to apply 1 time of nitrogen fertilizer and water spray before the shoots, and unify the shoots, and strive for all the autumn shoots in the middle and the middle of December. Robust autumn shoots enhance the nutrient accumulation of the tree, thus effectively resisting the cold current.
2. Do a good job in clearing the garden in winter and whitening the trunk. (1) Removal of dead branches and diseases: After the autumn shoots are matured, they are sprayed with a stone flow mixture of 0.9 to 1.2 Baume to prevent wintering pests. (2) Whitening of trunk: use 10 kg of quicklime, 1 kg of sulfur powder, add 30-40 kg of water, stir evenly, adjust to paste, brush the trunk and the first and second branches, which can effectively reduce the freezing damage.
3. Tree tray. Combined with the deep clearing of the Qingyuan Garden in the winter, the pond is covered with pond mud and turf for 100 cm in diameter, and the height is 10 cm above the trunk grafting interface, which can effectively protect the marrying interface.
4. Straw cover and tying. (1) In the winter, within 120 cm of the diameter of the tree tray, cover 10 to 15 cm thick with straw, orange stalk, rapeseed stalk, etc., or cover with the plastic film to increase the temperature of the soil. (2) Binding the trunk and the first and second branches with straw can play a role in tree protection.
5. Orchard irrigation. Before cooling, divert water into the orchard, carry out irrigation in the whole garden, and discharge after irrigation. If there is no irrigation condition, pick the water drenching tree tray. The adult tree will be watered for 100-120 kg per plant, which can supplement the water content of the tree and increase the soil and Air humidity, improve the temperature of the soldiers, and reduce the freezing damage.
6. The orchard smokes. Before the cold current, the orchard prepares flammable smoke such as chaff, sawdust and turf. It puts 1 pile every 10 meters and mixes a small amount of waste diesel oil to increase the smoke and heat. It ignites after 22:00 on the night of the cold current. Smoke, warm with smoke, keep warm and frost-proof.
7. Water spray and antifreeze. In case of wet freezing, the manpower should be quickly organized, shake the ice on the tree and spray the water to freeze.
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