Methods Before the harvesting of longan, the fertilizer was applied 15 to 20 days before harvesting. The main fertilizer was NPK, the plants above 5 years old, or the trees with 50 kg or more, and each application of NPK (15-15-15) ) Potassium sulfate or nitrate-based or pure sulfur-based compound fertilizer 0.75 ~ 1 kg, evenly spread on the topsoil under the canopy after rain. After harvesting the fruit in the longan, the post-harvest fertilizer is applied within 5 to 10 days. The quick-acting quick-acting nitrogen fertilizer and potassium fertilizer are mainly used. Each plant applies 0.75-1.00 kg of urea and 0.50-0.75 kg of potassium sulfate. After rain, it is evenly applied on the topsoil under the canopy. Just fine. In addition, at the same time as the root fertilization, it is necessary to carry out the top dressing. Spray a 0.2% to 0.3% potassium dihydrogen phosphate, 0.1% magnesium sulfate, and 600-800 times amino acid active liquid fertilizer mixture on the leaf surface before fruit picking. After fruit picking, spray 2~3 times of 0.1% magnesium sulfate, 0.2% urea, 0.3% potassium dihydrogen phosphate, 800-1000 times humic acid active liquid fertilizer mixture, spray once every 7-10 days, evenly spray wet All the branches and leaves inside and outside the crown are suitable to start with drops of water. Supplementing various nutrients from the foliage helps to stabilize and rejuvenate the tree.
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