Management measures of big cherry trees for 1-3 years

The root distribution of big cherry trees is relatively shallow, and the root distribution of young trees in 1-3 years is shallower, usually about 5-40 cm. In winter, the permafrost is 40 to 60 centimeters deep, and the whole root system of the tree is in the permafrost. On the other hand, the aboveground temperature in Beijing rises rapidly and high in early spring, and sometimes the temperature is as high as 20 ℃ in mid-late March. On the other hand, the ground temperature in the lower part rises slowly, and sometimes there is still a frozen layer below 20 cm in the first ten days of April. At this time, the root of the tree is still dormant, while the shoot buds are sprouting. This causes the imbalance of nutrients and water in the upper and lower parts of the tree, coupled with the frequent attack of cold snap, if we do not take some protective measures, it is easy to cause the phenomenon of dead trees and branches draining. According to the above-mentioned climatic characteristics in Beijing, some technical management measures should be taken for 1-3 years of big cherry trees to pass the winter safely. The main results are as follows: 1. First of all, improve the cold resistance of the tree itself, increase the storage of organic matter, and increase the application of phosphorus and potassium fertilizer in September, each plant is 2: 3 taels (pREUK is 1:2), the best potassium fertilizer is potassium sulfate. 2. foliar topdressing, spray potassium dihydrogen phosphate, spray 2 times 3 times, once every 7-8 days. 3. Pick the heart around October to remove the growth point of the autumn shoot and force the branches to stop growing ahead of time. 4. pour frozen water once before freezing after falling leaves, which is required to be fully irrigated. 5. Young trees must be protected through the winter. After the defoliation, first use a newspaper, and then wrap two layers of the trunk with plastic strips. The root of the tree is about 30 cm, and more soil is appropriate on the north side of the tree. Unwrapped branches can be protected with antifreeze. Antifreeze can use methyl cellulose, Jingfang No. 1, wax emulsion, etc., apply antifreeze generally 3-4 times, require two times before freezing, and twice from the end of February to early March of the second year, and require each branch to be brushed evenly. Remember to remove the plastic strip and newspaper when there is no cold spell in the next spring.