Answer: It is necessary to seize the favorable time between the fruit picking and before freezing, and timely fertilize the pear trees, which is conducive to the timely supplement of nutrients in the tree body, the enrichment of flower buds, and the quick recovery of the injured root system. The amount of topdressing in this period should account for 60% to 70% of the annual fertilization amount. The fertilization should be mainly organic fertilizer to increase the soil organic matter content, improve the soil aggregate structure, and enhance the permeability of the soil. Use the red triangle three-element compound fertilizer and middle and trace elements such as calcium, boron and zinc. Organic fertilizer mainly refers to soil and miscellaneous fertilizers such as human and livestock manure, pig, mutton and chicken manure, and artificially retorted straw. The method of fertilization is mostly by digging radial trenches. Generally, the trench width is 30-40 cm and the trench depth is 30-40 cm. The length of the trench should exceed the projected area of ​​the tree. Water in time after fertilization to facilitate the nutrient absorption of the tree and the restoration of the root system. Frozen water can also enhance the frost resistance of pear trees.
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