Citrus and navel oranges are both citrus evergreen fruit trees, with long fruiting period, large fruit-bearing quantity, wide, deep and dense root system, and they need to consume a lot of nutrients. For citrus and navel orange fertilization, the amount of fertilization and fertilization method should be adjusted according to the tree vigor, tree age, soil fertility, climate and other factors. For citrus and navel orange trees in the fruiting stage, vegetative growth and reproductive growth are prone to conflicts. The task of fertilization in the growth and fruiting period is to coordinate vegetative growth and reproductive growth, so that the two can develop simultaneously and enter the full fruit period as soon as possible. Fertilization is generally divided into four times.

The first time is to urge the shoots to strengthen the flower fertilizer, with the standard of 30 kg of fruit trees, 5 kg of bio-organic fertilizer, and full spring water. Complete the fertilization and irrigation tasks before the end of February. Radioactive ditches are opened in flat orchards, and sloped orchards are used to ditch the other side.

The second time is a strong fruit fertilizer, with a 30 kg fruit tree as the standard, and 2 kg of bio-organic fertilizer applied in early July.

The third time is nutrient accumulation fertilizer, with 30 kg of fruit trees as the standard, and 3 kg of bio-organic fertilizer applied in late September.

The fourth time is the post-harvest fertilizer. After the fruit is harvested, individual plants have too much negative fruit, and the tree vigor is weak. A small stove can be used to apply 2-3 kg of biological organic fertilizer.