What medicine does Shatangju use to prevent freezing?

Freezing injury is the limiting factor of Shatangju production. In the northern edge of Shatangju cultivation, it is necessary to strengthen the anti-freezing nursing work before winter.

1, fertilizing to restore tree vigor. Before and after fruit picking, water is used to irrigate the roots, and foliar spraying (0.2%-0.3% potassium dihydrogen phosphate plus 0.5% urea mixture or advanced compound fertilizer) is used to supplement nutrients, so as to promote rapid recovery of tree vigor, increase nutrient accumulation, make trees grow healthily and enhance cold resistance. After applying organic fertilizer to keep warm.

2. Cultivate the soil. After fruit picking, combining pruning with garden cleaning, digging and fertilization, pond mud, river mud, field soil and so on are selected. And cultivate 20-30 cm thick root-neck tree trays to protect the roots, raise the temperature and prevent freezing.

3. Irrigation and heat preservation. The orchard that produces drought should be fully irrigated 10-20 days before freezing at low temperature, and the canopy should be sprayed with water during the frost falling period to reduce freezing damage, so it is called "antifreeze water".

4. Chemical antifreeze. Before the low temperature comes, spraying chlormequat chloride and heat preservation agent on the tree crown can promote the accumulation of cell sugar, inhibit leaf transpiration, reduce the heat loss of trees and reduce the degree of freezing injury.

5. Soil cover. Before the cold comes, through ploughing and soil preparation, the garden is covered with plastic film to reduce the soil temperature and protect the roots from freezing injury.

6. Protect this tree.

① Covering and crown protection: wrap the whole young tree with straw and cover the crown to prevent direct frostbite of branches and leaves.

② Protect the trunk and branches: daub cow dung and yellow mud, and wrap the accumulated grass or woven bag to reduce the temperature difference and prevent the branches from frostbite.

(3) Fence wind barrier: In the vertical direction between the orange orchard and the wind, a 1 wind barrier with the height of citrus reticulata is set every 1 20m, so as to reduce the wind speed, reduce water evaporation and severe cooling, and reduce the degree of freezing damage.

7. Smoke to warm up. Look at the weather forecast, use firewood, sawdust, chaff, straw, etc. Set 4-6 stacks of smoke per mu, ignite smoke before the cold wave or frost comes, and form a smoke screen over the orange orchard to suppress radiation and frost, and at the same time directly increase the temperature of the orange orchard and reduce freezing damage.