How to operate Taoyuan after Frost?

1. Why do peach trees freeze? According to the experience of peach tree management, the probability of directly freezing peaches in winter and late spring is very low. During the dormant period, peach trees can withstand a low temperature of about MINUS 25 degrees. With the arrival of spring, the temperature rises gradually, the juice of the root system moves, and the buds begin to swell, which will consume the stored nutrients. The more flowers and fruits grow, the more storage nutrients are consumed, and the cold resistance will inevitably decline. It shows that the storage nutrition is closely related to the cold resistance of trees.

There are also great differences between varieties. The average temperature reached 1 4 and 5 degrees for four consecutive days from 18 to 12, and the highest temperature reached18 degrees. 1 The temperature dropped sharply to 17 degrees for four consecutive days from August 8 to June 22, and it was 13 degrees in February. Although the first cold current in January lasted for four days at minus 17 degrees, it did not harm peach trees.

The second cold current dropped to-10 degrees on February 4th, and it was-13 degrees in some areas. It is not the first time that it has fallen sharply, but it is the most harmful to peach trees, causing the varieties with poor stress resistance to fall off their buds due to freezing, and the cortex of stems (branches) is damaged, resulting in gummosis, which seriously causes dead branches and trees and causes great losses to some peach farmers. The reason is that in mid-February, the flower buds of peach trees obviously expanded and some turned red, which consumed more storage nutrients and reduced the cold tolerance. It shows that some varieties will be frozen as long as they are obviously swollen below-10 degrees, and must be prevented in advance in combination with local weather forecast. The main poles and branches can be painted white, and sprayed with water, nutrient solution, antifreeze, smoke, etc.

The varieties with poor resistance in Yuncheng area include Zaohong Buruan, Hongburuan, Chunmi and Shandong Dahongtao. Peach trees can bear the low temperature of -2-3 degrees when flowering, and can only bear the low temperature of -0.8- 1.5 degrees when flowering. But long-term low temperature can also cause damage to flowers. The damage of flowers varies greatly. The trumpet mouth is the most serious, with the mouth facing both sides, and the lightest in winter. After three freezing injuries in flowering period, it was found that when the temperature dropped to MINUS 5 degrees, a small number of flowers were not frozen (Zhongtao No.3) and bore fruit.

Second, after the leaves are frozen, they should be repaired in time to reduce the damage.

After the peach tree is frozen, the flowers are damaged, and the embryo will soon fall off when it turns black. The leaves wilt and change color due to freezing, and will gradually recover with the gradual increase of temperature. Even if it drops to MINUS 5-6 degrees, it won't freeze to death. It may be that the young leaves are nutritious and cold-resistant. In this case, the main stem and branches are low from the ground, and the varieties with poor stress resistance will cause the cells in the inner cortex to be damaged by freezing. Relatively speaking, the trunk facing southwest is more harmful to branches than other parts, because the direct sunlight lasts for a long time and the temperature is higher than other parts. The greater the temperature difference, the more serious the damage.

That's because the injured part of the tree can't stand the drastic change of temperature and suffer. In order to reduce the damage, lightly damaged embryos (slightly white) were sprayed through the leaves of branches with 1200- 1500 times of JFN raw powder. Advanced nutrition can quickly replenish energy, activate and repair damaged cells and reduce damage. Of course, dead embryos can't be repaired. Through the absorption of stomata in the branch cortex, the frozen inner cortex can produce callus and heal as soon as possible, which can reduce gum diseases and make the tree grow quickly. It can also be sprayed with 1000 times 10.3% urea. Lay the foundation for next year's bumper harvest.

Third, the affected varieties should be treated differently.

1, some varieties have serious freezing damage in some areas, so the economic benefits of this variety should be considered first. If it is good, we should strengthen post-disaster management and restore the growth of trees as soon as possible. During the growing season, everything should be fertilized, watered and mowed in summer, and attention should be paid to plant protection. Because peach trees are fruitless and weak after the disaster, peach farmers are most likely to give up their business and are often the most prone to diseases and insect pests.

2, for the unpopular outdated varieties in the market, we must make decisive decisions! For ancient trees, they can be dug up and replanted to make up for the losses. For young trees, if the scions of varieties are well stored, they can be grafted and replanted (root grafting is recommended), and the second year's output will be better. We don't advocate high grafting, because practice has concluded that most varieties will be 7- 10 days late and the selling price will be low if they pass high grafting.