Soil fertilization method: The chestnut garden with shallow soil and severe nutrient deficiency benefits greatly from this fertilization approach. A circular trench was dug along the drip line of the chestnut canopy, with a width of 25 cm and a depth of 20 cm. Each tree received 1 kg of calcium phosphate, 0.3 kg of urea, and 0.25 kg of borax. When applying the fertilizer, it's important to dissolve urea and borax in water first before pouring them into the trench. Water should be applied simultaneously during fertilization to help the nutrients penetrate the soil. After the process, the trench is filled back to prevent nutrient loss due to evaporation. Adding a small amount of soil mixed with fertilizer during application has proven effective in promoting multiple harvests and reducing the occurrence of empty chestnuts the following year.
Extra-root top dressing: This technique is particularly beneficial for chestnut trees growing in various soil types during the summer season. Prepare a mixture of 0.3%-0.4% urea solution, 0.3%-0.5% potassium dihydrogen phosphate solution, and 0.3%-0.4% borax solution. Spray the canopy early in the morning before 9 o'clock on sunny days or in the late afternoon after 3 o'clock. Apply the solution every 10 days, repeating the process twice. If heavy rain occurs after spraying, it's recommended to reapply the fertilizer within 10 hours to ensure optimal absorption and effectiveness. This method not only improves overall tree health but also enhances fruit quality and yield.
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