The high yield of oranges indicates that orange trees need more fertilizer, and when in the fruiting stage, fertilizer should be applied to the tree 3 to 4 times a year.

Post-harvest fertilizer should be applied for one of those fertilization periods, and should account for 50% of the total amount of fertilizer applied in a year. high calcium organic seaweed fertilizer, and trace element fertilizers should be applied to promote nutrition absorption, root growth and flower bud growth.

Nitrogen fertilizer should be applied during the germination stage in the spring, in order to promote the growth of new branches, delay the dropping of old leaves, and improve the fruit set rate. seaha seaweed fertilizer with humic acid, Plant Root Stimulator, seawinner microbial fertilizer or seawinner extra 30 are recommended.

Fertilizer for fruit growth should be applied any time after physiological fruit drop. Potassium fertilizer NPK 16-8-18 granular fertilizer is recommended to promote fruit growth, increase the fruit sweetness, and promote color changing.