Chestnuts must be applied before harvesting and post-harvest fertilizer

Chestnut trees have a long fruiting season and produce a large quantity of nuts, which consumes a significant amount of nutrients. During the period before and after the fruit ripens, the tree's vitality is often in a state of starvation or partial hunger. This weak condition can hinder flowering and fruiting in the following year. To prevent this, it's essential to apply pre-harvest and post-harvest fertilizers in a timely manner to replenish nutrients, help the tree recover quickly, and restore its vigor. This will lay a solid foundation for high yields and stable production in the next season. Here are some specific practices: When the chestnuts begin to turn brown, it's time to apply pre-harvest fertilizer. The main type should be a quick-release fertilizer. For trees that bear over 50 kg of fruit, apply 1.5 to 2 kg of urea and 0.5 to 1 kg of potassium chloride per application. If possible, apply it after rain or use decomposed human and animal waste water at 80 to 100 kg per tree. After harvesting, apply post-harvest fertilizer 5 to 10 days later. This should include NPK fertilizer (2 to 3 kg per tree) and high-quality organic matter such as cooked peanut bran (1.5 to 2 kg). Also, add 25 kg of well-decomposed manure. Dig a ring ditch around the canopy, about 25–30 cm wide, and apply the fertilizer there. If the weather is dry, water each tree with 80 to 100 kg of decomposed manure water after fertilizing to help dissolve the nutrients and improve root absorption. In addition, during the pre- and post-harvest periods, it's important to spray foliar fertilizers. Mix 0.1% magnesium sulfate, 0.3% urea, 0.5% potassium dihydrogen phosphate, and 0.1% triacontanol, and spray the leaves 3 to 5 times every 7 to 10 days. This helps boost the tree's nutrient uptake and supports better growth and fruiting in the next season.

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