Peach trees. The cause of frostbite, generally speaking, is because. First, when choosing a peach variety. Only pay attention to the yield of peach trees. Ignore the temperature difference between north and south. Restrict. Such as peach trees in the southern population. Into the north. When encountering sudden cold air. Frostbite can also freeze to death Peach trees. In the total group of peach trees in the north. Peach trees are dormant. More than ten degrees below zero, safe and sound. If peach varieties from the south are introduced to the north. Easy to get frostbite.
Second, improper management. Although peach trees can tolerate a low temperature of MINUS 10 degrees during dormancy. However, if the peach tree. In the late flowering period, in case of sudden cold wave, fruit trees will also be frostbitten, resulting in less fruit hanging on peach trees. The reason of frostbite of peach trees is that too much nitrogen fertilizer is applied, which leads to the white growth of peach trees. The cell wall of the overgrown branches becomes thinner, and the cold resistance is poor, which is prone to freezing injury. Therefore, in peach tree management, we must pay attention to the ratio of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer to avoid using a large amount of nitrogen fertilizer.
Loose management and insufficient nutrient reserves in the later period of peach trees can also cause freezing injury. For example, high-yield peach trees have insufficient nutritional supplements after a large number of fruits. In the coming year, the bud door will become weak and the branches will not be frost-resistant. That is what we ordinary people say. The fruit trees are "tired". Therefore, 0.5% potassium dihydrogen phosphate+brassinolide+thiamethoxam+zinc fertilizer is sprayed on the leaves of peach trees every 7- 10 days before defoliation. When the tree is weak, spray 0.5% potassium dihydrogen phosphate+1% urea+1% brown sugar+brassinolide before the peach leaves fall in autumn. It can make nutrients fully reflux and enhance the cold resistance. At the same time, overwintering fertilizer should be used as early as possible in autumn. The overwintering fertilizer is basically applied to the deep border and filled with fully decomposed livestock manure. Water it in winter.
After the peach trees have fallen leaves, spray 3-5 baumeishi sulfur mixture comprehensively. Boil the mixture of stone and sulfur. Use quicklime, sulfur and water. Prepare raw materials according to the ratio of 1: 2: 10. Usually, the general method of boiling the mixture of stone and sulfur is to put the prepared quicklime into an iron pot. Crushing sulfur, and mixing with water into paste for later use. Pour the water into the pot and heat it to boiling with fire. Then slowly pour the prepared sulfur slurry into the pot, stir while pouring, keep the temperature in the pot at 100 degrees, mark it at the same time, continue to boil, and add water in the middle. About 15 minutes before the ceasefire. Stop adding water to the iron pan, keep the original liquid level and cook for about 60-70 minutes. In this way, the original solution of reddish-brown transparent stone sulfur mixture with a concentration of 23-28 Baume degrees was prepared. The diluted stone sulfur mixture is used for spraying in the whole garden. The residual residue of sulfur mixture can be made into whitening agent. The residue of sulfur mixture is mixed with quicklime, water and salt. According to. The ratio of 0.5: 5: 20: 0.5. Make a comparison. Then paint the trunk white to reduce the occurrence of frostbite.
If possible, the trunk can be wrapped in plastic film to keep out the cold. Or tie it with straw rope to keep out the cold. In normal years, the weather gradually turns cold, not a sudden cold wave. As long as it is a peach tree adapted to this area, it will basically not freeze to death. In order to prevent a sudden cold wave, the temperature was greatly reduced. You can cover the tree tray with wheat straw, rice straw, corn straw, etc., which can play a role in preventing cold and keeping warm.