Summer fertilization of Chinese Chestnut

In order to improve the yield and quality of Chinese chestnut, chestnut trees should be fertilized in summer. there are two main fertilization methods: soil fertilizer method: the soil fertilizer method is better in the chestnut orchard with thin soil and serious lack of fertilizer. A circular trench with a width of 25 cm and a depth of 20 cm was dug in the drip line of chestnut canopy. Each plant was applied 1 kg of superphosphate, 0.3 kg of urea and 0.25 kg of borax. When fertilizing, urea and borax should first be dissolved in water, and then ditch application, while fertilizing while splashing water. Return to the soil to fill the ditch in time after fertilization to prevent the volatilization of nutrients. If an appropriate amount of soil miscellaneous fertilizer is added to fertilize the soil, it is effective to promote the more fruit and reduce the empty bract rate of Chinese chestnut in the following year. Extra-root topdressing method: this fertilization method is effective for chestnut trees on all kinds of soil in summer. After mixing 0.3-0.4% urea solution, 0.3-0.5% potassium dihydrogen phosphate solution and 0.3-0.4% borax solution, spray the tree crown before 9: 00 a.m. or after 3: 00 p.m. on a sunny day, spray again every 10 days, and spray twice in a row. After spraying fertilizer, it should be sprayed again in case of heavy rain within 10 hours to ensure the effect of fertilization.