Fertilizer management is crucial during the flowering and leafing period of Ximi Pomelo trees, as both processes require a significant amount of nutrients. Proper fertilization ensures that the tree has enough energy for healthy growth and fruit development. A combination of soil application and foliar feeding can enhance flower quality and increase fruit set.
Soil Fertilization: For mature trees, apply 1.5 to 2 kg of specialized fertilizer per plant before flowering. This can be supplemented with 0.75 kg of urea or 0.5 kg of calcium nitrate, or 1 kg of ammonium nitrate combined with 0.3–0.4 kg of potassium sulfate. Alternatively, 0.75 kg of urea plus 0.3–0.4 kg of potassium chloride can also be used. For young trees, mix 0.75 kg of ammonium bicarbonate with superphosphate and 0.15 kg of potassium sulfate, or use 0.5 kg of special pomelo fertilizer mixed with 0.1 kg of urea. Before flowering, it's important to apply a small amount of nitrogen-rich fertilizer, such as 0.5 kg of calcium nitrate or 0.5 kg of special fertilizer, to support strong bloom development.
Foliar Spraying: Before flowering, spray a solution containing 50–100 g of imported urea, 100–150 g of urea, 25 g of ammonium molybdate, 100 g of potassium chloride, 200 g of magnesium sulfate, and 130–150 ml of nutrient solution per 50 kg of water. Repeat this 10–15 days later. During flowering, use 50 g of boric acid and 25 g of ammonium molybdate in 50 kg of water, applying every 5–7 days for 2–3 times. After flowering, spray a mixture of 150 ml of fruit nutrient solution, 200 g of magnesium sulfate, 100 g of potassium dihydrogen phosphate, 150 g of imported urea, and 50 kg of water. Seven to ten days after flowering, add 1 gram of "920" (gibberellic acid) per 50 kg of water to promote fruit growth.
Pruning is essential during the spring season. Focus on removing excessive spring shoots, trimming the top of the canopy and cutting back dense shoots. Cutting the tip of the new growth by one-third to two-thirds helps reduce nutrient competition between leaves and flowers, improving overall flower quality.
Thinning is also important. Remove weak, deformed, or unproductive flowers and buds. Leave 2–4 flower buds per cluster, and for heavily flowering trees, aim for 80–120 healthy flower clusters per plant. Thin fruits after the second physiological drop, removing any malformed or weak fruits to ensure better fruit size and quality.
Ring-cutting is another technique used to improve fruit set. When the tree is about halfway through the flowering stage, make 2–3 spiral cuts around the branches. This helps redirect nutrients to the developing fruits and increases the fruiting rate.
Pest control is vital during the flowering period. Common pests include anthracnose, scab, aphids, red spider mites, and leaf miners. Apply copper-based fungicides like copper soap, thiophanate, or carbendazim when new shoots reach 2 cm in length. For pest control, dust the entire garden with 605 powder before bud emergence. During and after flowering, spray dichlorvos or trichlorfon to manage locusts, leaf beetles, and mites effectively.
For non-healing trees caused by improper ring-cutting or pesticide damage, re-injure the wound by making a new cut above and below the original area, then scrape away the rot. Cover the wound with black tape, blue plastic film, or fresh cow dung mixed with red earth to speed up healing. For yellowing trees, apply a root drench with 100 g of root nutrient solution, 100 g of potassium dihydrogen phosphate, and 150 g of calcium nitrate in 25 kg of water, repeating 2–3 times. Strengthen root feeding to restore tree health.
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