I. Main Measures to Improve Fruit Quality
1. Scientific Fertilization. Throughout the year, spring fertilization, fruit stabilization, and fruit enhancement fertilizers are applied. Organic manure is primarily used in combination with chemical fertilizers. Quick-acting fertilizers should be used alongside precipitating and stabilizing fertilizers, and decomposed manure water should be spread over the soil. From June to September, the focus is on applying cooked bran fat, such as peanut bran and rapeseed bran. It is recommended to apply calcium superphosphate to fully decompose and loosen the manure, which significantly improves fruit quality.
2. Green Manuring and Tree Covering. During summer, sufficient green material is available for digging trenches and filling them with organic matter, improving soil structure and fertility. Weeds can also be used to cover tree bases, helping regulate soil temperature, reduce evaporation, and maintain moisture, ensuring adequate water supply for both tree growth and fruit development.
3. Proper Water Supply. During the fruit growth and enlargement phase (especially June to August), a balanced irrigation schedule ensures normal cell expansion in the fruit pulp, leading to better fruit size and quality. However, excessive or irregular watering during the late ripening stage may cause the fruit to absorb too much water, reducing sweetness, flavor, and storage ability.
II. Main Measures to Enhance Fruit Appearance
1. Fruit Bagging. Bagging helps prevent diseases and results in smooth, attractive skin. Before bagging, it's essential to spray fungicides, such as 70% thiophanate-methyl at 1000–1500 times dilution, 50% sterilizing king (Huiheng No. 6) at 1500–2500 times, or 50% carbendazim at 1000–1200 times. Additionally, 80% Dasheng M-45 at 600–800 times or 1 packet of 100g per 80–100kg of water can be used. Spraying 18% Chlorinated Emulsion at 1200 times helps control pests and bacteria on young fruits.
2. Foliar Fertilization. After applying organic fertilizers, foliar sprays can be done from August to September. Spraying Fengfeng at 1000–1200 times, fruit expanders (100g per 60kg water), and coloring sweeteners can enhance fruit sweetness, uniform shape, and vibrant color. A second application before harvest improves overall appearance and taste.
3. Timely Pest and Disease Control. Pomelo trees are prone to canker and anthracnose. Treatments like 8g of naltrexil per 30kg water or 100g of orange juice per 80–100kg water can help manage these issues effectively.
III. Pest Control
Scale insects, red spiders, and rust mites can damage the fruit surface, making it unattractive. Throughout the growing season, preventive measures using appropriate pesticides are crucial. For scale insects, spray 95% wax at 2500–3000 times or 1000 times New Fast-Acting Fleas with 200 times oil emulsion (Hui Ling) in early May. In August and September, use 1000–1500 times spray of Rust Ban for mites. For spider mites, mix oil emulsion with 1500–2000 times of enemy or Skull Swordsman, or Krypton at 2000 times. For leaf miners, use Moth Treasure at 1000–2000 times or Swordsman at 1500–2000 times.
IV. Timely Harvesting
In normal years, harvesting is typically done between October 25 and November 10. Harvesting too early leads to underdeveloped fruit, poor quality, green peel, and low sugar content. The pulp becomes coarse and less juicy. Therefore, waiting until the right time ensures optimal fruit quality and appearance.
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