The fertilization of pears should be based on basal fertilizers. The best basal fertilizer application time is autumn, early maturing varieties are harvested after harvesting; middle and late mature varieties can be harvested before fruit harvest. In the fertilization of pear orchards, it was emphasized that the nitrogen fertilizer should be dominated by autumn fertilizer (from September to October) and winter fertilizer (from late January to mid-February) in the previous year, with a particular emphasis on autumn fertilizer. Since autumn is the second peak of rapid growth of pear roots, the roots after fertilization are more likely to heal wounds and play a certain role in root pruning, which promotes the germination of new roots. It is beneficial to the absorption and accumulation of nutrients. Organic fertilizers and chlorine-phosphorus-potassium fertilizers that require basal fertilizer are best applied in time to facilitate the accumulation of nutrients in pear trees and timely adjustment and supplementation. However, fertilization in autumn should not be excessive, otherwise overgrowth of the aboveground parts will cause the tree's storage nutrition to decrease, and it will be susceptible to freezing damage. If it is in the period of frost, the leaves of Pear are dark green and not red, and they are dried up on the head of the tree, which is caused by too much fertilizer. The application time of topdressing has certain differences due to the different tree potentials, and it usually takes place before germination, flowering, and fruit expansion. In the orchard fertilization, potassium fertilizer is mainly summer fertilizer. Phosphorus fertilizer is available at any time during the year, but it is more convenient to apply all the base fertilizer in autumn. The specific allocation of fertilizers depends on the strength of the soil. In the fertile soil of pears, nitrogen fertilizer is used as autumn fertilizer at 30%, winter fertilizer is 70%, potassium fertilizer is applied at late winter (from late January to mid-February), and spring fertilizer (from late March to 4). In the first half of the month, 25% is applied to each, and then in June and July, 25% each is applied. Under the condition of poor soil fertility, nitrogen fertilizer is applied at 30% (at 2-3 times) of autumn fertilization, 20% at winter fertilization and 10% at spring fertilization, with 40% remaining 4 times (early May and late May). , In mid-June and early July) 10% each. In short, in the pear orchards with low fertility, nitrogen fertilizer should work best with a small number of times. The specific method of fertilization depends on the size of the tree. Rotational fertilization is generally used when the tree is small. The location of the fertilization is 0.5-2.5 meters outside the crown, and the width of 20-40 centimeters wide and 20-30 centimeters deep. The fertilizer is mixed with the soil and then applied into the ditch, and the ditch is filled. It is best to use whole-garden fertilization for adult pears, and combine fertiliser into soil. Since the roots of pear trees are mainly concentrated in the 20-60 cm soil layer, and the growth of the root system has obvious fertility, it is best to apply 20-40 cm deep soil layer to the organic fertilizer and phosphorus and potassium fertilizers to improve the root system. The depth and breadth of the distribution increase the absorption area of ​​pear trees and improve their drought resistance and tree solidity. Laparoscopic Instruments,Graspers Laparoscopic,Retractors Surgical Forceps,Duck Jaw Grasper ZHEJIANG SHENDASIAO MEDICAL INSTRUMENT CO.,LTD. , https://www.sdsmedtools.com