The young trees are expanded and soiled in 2-3 years after planting. Dig two large holes 60-80 cm deep, 50-60 cm wide and 150-200 cm long in the opposite direction outside the original planting hole, east-west or north-south. Bury green manure, bio-organic fertilizer in layers, and mix some lime, superphosphate, etc., and then return to soil to cover.

The second time was in the other two directions. When expanding the hole and changing the soil, plant 30-50 kg of green manure, 5-10 kg of bio-organic fertilizer, add a small amount of lime and 1-2 kg of superphosphate, and then cover it with soil. The longan tree that is first put into production is a transitional stage from a young tree to an adult tree. The result is not stable. During this period, it is necessary to put it into production and to ensure that it continues to grow and expand the crown. It can only produce a moderate amount, and the plant yields about 10--30 kg.

The first longan trees put into production are mainly applied with biological organic fertilizer, and pay attention to the combination of nitrogen, phosphorus and potassium. In winter, apply bio-organic fertilizer once every two years. Apply bio-organic fertilizer once in February, plant 1-2 kg, urea 0.5 kg, superphosphate 1 kg. In June, the plant can apply 2 kg of bio-organic fertilizer, 0.5 kg of urea and 1 kg of potassium chloride. In August, 3 kg of bio-organic fertilizer was applied, and the amount of fertilizer increased year by year as the amount of fruit increased and the canopy expanded.

In order to meet the needs of tree growth and fruiting, adult fruiting trees are usually fertilized 5 times a year to achieve high and stable yields.

For the first time in early February before and after the beginning of spring, applying 2-3 kg of bio-organic fertilizer can promote the development of flower ears, increase earing rate and increase flower ears.

For the second time in April from Qingming to Guyu, applying 2-3 kg of bio-organic fertilizer has a significant effect on promoting summer shoots and increasing fruit setting.

For the third time in late June, 3-5 kg of bio-organic fertilizer was applied to the plant to supplement and adjust the thinning of the fruit ears. The young fruit grew rapidly and cultivated the nutrients needed for strong summer shoots.

For the fourth time, it was applied from late July to early August, one month before fruit picking. During this period, the pulp expanded rapidly and the root system had strong fertility absorption. Fertilization had a significant effect on increasing yield and reducing late fruit drop. Generally, bio-organic fertilizer was applied. 5--8 kg.

For the fifth time in September, apply 3--5 kg of biological organic fertilizer to promote the extension of summer shoots or autumn shoots, and cultivate strong fruiting mother shoots. Different areas can increase or decrease the number of fertilizers according to the longan tree vigor and soil fertility.