Longan trees require special handling after harvest to maintain or increase productivity. To achieve this, prune branches and twigs to keep the plant short and promote compact branching. Additionally, apply 5-6 kg of cow or goat manure to each tree to accelerate the growth of new branches and twigs.

After 2 months, apply NPK 15:15:15 compound fertilizer at a dose of 0.5 kg per tree. The second fertilization should be carried out 1.5 months after the first one using NPK compound fertilizer with a higher ratio of phosphorus (P) and potassium (K) than nitrogen (N) at a rate of 0.5 kg per tree.

To stimulate the generative or fruiting phase, apply 250-300 grams of potassium chlorate per tree. Dissolve the potassium chlorate in 3-4 liters of water and sprinkle it around the crown. After a month, new shoots and flower buds will usually appear. If there is a large number of flowers, apply manure every month for 3-4 months at a dose of 2-3 kg per plant.

When the fruits reach half-marble size, apply NPK compound fertilizer with higher levels of nitrogen than phosphorus and potassium. Alternatively, use urea fertilizer. Then, immediately prune by reducing 30-40% of the fruit clusters to maximize and uniformize fruit production. To prevent the fruit from falling off easily, apply NPK compound fertilizer with higher levels of potassium than nitrogen and phosphorus.