Chestnut trees have a long fruiting period, a large amount of results, and consume more nutrients. Before the fruit matures, the tree vigor is in a state of starvation and semi-starvation. If nutrition is not added in time, it will seriously affect the flowering results in the coming year. Therefore, it is very important to apply chestnut pre-harvest fertilizer and post-harvest fertilizer to accelerate the restoration of tree vigor and promote the tree vigor so as to lay a good foundation for high yield and stable production in the second year. The specific approach is as follows: When the chestnut fruit turns brown, the pre-harvest fertilizer is dominated by quick-acting fertilizers. The strain results in trees of 50 kg or more. Each plant applies 1.5-2 kg of urea and 0.5-1 kg of potassium chloride, and spreads it after the rain. The post-harvest fertilizer is applied within 5-10 days after the fruit is harvested, mainly NPK fertilizer and high-quality organic fertilizer. Each NPK fertilizer is 2-3 kg, and the cooked man and livestock poultry manure is 25-30. kg. Draw dripping lines around the canopy and dig depth and width of each 25-30 cm ring ditch for fertilization. If the weather is dry, fertilize each tree after fertilization and apply 80-100 kg of decomposed human or animal manure water to promote fertilizer dissolution and transformation, supply root absorption and utilization, and improve fertilizer application. In addition, before and after fruit harvesting, the leaves were sprayed with fertilizer and sprayed 2-3 times with 0.3% urea + 0.5% potassium dihydrogen phosphate + 0.2% borax mixed liquor and sprayed once every 7-10 days. Other nutrient solutions can also be used. Foliar spray fertilizer to choose no wind or breeze cloudy best, and before 9 o'clock in the morning or after 4 o'clock when the stomatal opening spray, spray heavy rain within 10 hours after spraying need to re-spray. Wenzhou Celecare Medical Instruments Co.,Ltd , https://www.wzcelecare.com