In the cold winter, the frozen layer of soil is deep, and the apple saplings are shallow in the root layer. Most of them are located in the frozen layer. The absorption and transport of water are poor, which can not meet the transpiration of the branches and water, and it is easy to cause freezing damage. The strips (ie, the branches are dehydrated and dry) In severe cases, the whole plant died. The antifreeze method for apple saplings is as follows:
Fertilization method Before the fruit tree leaves, the fertilization method can be applied by open annular groove or radial groove fertilization once. More fertilized organic fertilizers such as sheep manure and chicken manure, and phosphorus and potassium fertilizers are used to increase temperature and promote roots, and to increase cell water content, which is beneficial to wintering and antifreeze.
Irrigation method Any garden that lacks sputum, if there are irrigation conditions, can be frozen once before the earth is frozen, in order to increase the temperature and balance the ground temperature to facilitate antifreeze.
Bent dry soil cover method Any young tree planted in the autumn of that year, you can dig a small ditch 10 to 15 cm deep in the tree, and bend the trunk into the ditch. The upper side can cover 25-30 cm. In the second half of the next year, you can help the earth. In doing so, one can prevent freezing, and the second can prevent the rabbit from injuring the bark. Before the winter, the main soil method can be used to smash a small mound around the trunk, up to 30-40 cm, and the ground diameter is 40-60 cm. After thawing in the spring of the next year, the mound can be opened to reveal the trunk. The benefits are the same as the curved dry cover method.
Before the tree cover method is frozen, the sapling tree can be covered with 20~25 cm thick straw or 1 layer of agricultural film or 1 layer of grass ash, which can play the role of protecting and warming, and achieving the purpose of antifreeze. .
When the protective agent spray method is used for wintering, the tree may be sprayed with a paraffin water-retaining agent 10 times solution, or a carboxymethyl cellulose 150-200 times solution, or a mildew 200-300 times solution. It can also be sprayed once for the high-fat film of Jingfang No. 1 to close the lenticels, reduce water transpiration and prevent pumping.
Tied grass and wrapped plastic film can be used to tie a straw around the trunk (grass, wheat straw, corn stalks, etc.), or cut a 0.02-0.03 mm thick agricultural film into 4-6 cm wide plastic strips to entangle the trunk. . It is required to be tightly packed and compacted, and the film is tightly closed. The film is released in the second half of next year.
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