In the growing season, quick-acting fertilizers are generally applied topdressing, and they are applied slightly before the chestnut trees are in urgent need. According to the fertilizer requirements of chestnut trees during the growing season, the characteristics of top dressing in each period are as follows.

In the germination period, it is carried out before and after germination. Nitrogen fertilizer is the main fertilizer, and phosphorus, potassium fertilizer and boron fertilizer are applied in combination. Apply 0.15 to 0.25 kilograms of urea to each tree in the early fruiting stage, and 1.0 to 1.5 kilograms of urea to each tree in the full fruiting stage to promote the growth of new shoots and the development of female flowers. In addition, 1 kilogram of boron fertilizer is applied per 667 square meters to promote flower bud differentiation, pollination and fertilization.

Before and after flowering, quick-acting compound fertilizers containing nitrogen, phosphorus and potassium are mainly used. The amount of application is 0.5 to 1.5 kg for trees in the young fruit stage and 1.5 to 2.5 kg for trees at the full fruit stage.

The rapid fruit expansion period occurs from the end of July to mid-to-late August. Topdress with a quick-acting compound fertilizer based on potassium fertilizer. Apply 0.2 to 0.3 kilograms of potassium dihydrogen phosphate, 0.1 to 0.2 kilograms of superphosphate, and 0.2 to 0.5 kilograms of urea per plant.