Longan is heat-resistant, not cold-resistant and likes hot longan how to survive the winter safely

Longan overwintering

1. Cultivate strong autumn shoots. Autumn shoot is not only the mother branch of longan in the coming year, but also one of the main branches of longan overwintering, whether the autumn shoot is strong or not is related to whether it can survive the winter safely. Therefore, it is better for the last autumn shoot of longan to be released in mid-and late October. Before releasing the shoot, it is best to apply nitrogen fertilizer thinly and sprinkle it with water, so as to strive for the maturity of all autumn shoots in the first and middle of December. Strong autumn shoots can enhance the accumulation of nutrients in trees, thus effectively resisting the cold current.

two。 Do a good job of clearing the garden and painting the trunk white in winter. (1) removal of withered branches and diseased leaves: after autumn shoots were ripe, 0.9-1.2 Baumedu Stone flow mixture was sprayed to control overwintering diseases and pests. (2) White trunk: using quicklime 10 kg, sulfur powder 1 kg, adding water 30-40 kg, stirring evenly, adjusting to paste, painting trunk and primary and secondary branches, can effectively reduce freezing injury.

3. Tree plate bacon. Combined with the deep ploughing of the garden in winter, the 100cm diameter of the tree plate was covered with pond mud, turf and so on. The height reached the 10cm above the trunk grafting interface, which could effectively protect the grafting interface.

4. Covered with straw and bound. The main results are as follows: (1) within the diameter of 120cm around the tree plate in winter, the soil temperature can be increased by using rice straw, orange stalk and rape stalk to cover 10~15cm thickness or plastic film mulching. (2) binding the trunk and the first and second branches with rice straw can keep the tree warm.

5. The orchard is watered. Before cooling, draw water into the orchard and irrigate the whole orchard. If there is no irrigation condition, the tree plate will be drenched with water, and the adult longan tree will be drenched with 100kg to 120kg per tree, which can replenish the tree moisture, increase the soil and air humidity, increase the temperature of the tree, and reduce the freezing injury.

6. Smoke in the orchard. Before the cold snap comes, the orchard prepares combustibles such as husks, sawdust and turf, and puts them in a pile every 10 meters, mixed with a small amount of waste diesel oil, which can increase the heat of the smoke. After 10:00 in the night when the cold snap comes, light the smoke and heat up with the smoke to keep warm and prevent frost.

7. Spray water to prevent freezing. In case of wet freezing, you should quickly organize manpower, shake off the ice on the longan tree and spray water to thaw.