For citrus special fertilizer, it is better to choose balanced water-soluble fertilizer, which is richer in nutrient elements, and plants grow better and more prosperous. It is better to use phosphorus and potassium fertilizer as top dressing, which can promote more flowering and fruiting of plants.

1. It can be applied in circular ditch and strip ditch. The applied farmyard manure must be fully fermented and decomposed; the one-time application of chemical fertilizers should not be excessive, and should be applied thinly and frequently. In addition, the main root layer of adult trees is distributed at a depth of 40 to 60 cm in the soil. The main absorbing root is the root tip of the fibrous root-the new root part, which should be used as a basis for determining the depth and position of fertilization.

2. Carry out in November to December. The specific method is to apply once every other year, staggered between plants, excavate radial or semi-circular or circular fertilization trenches from the drip line of the canopy, and be careful not to cut off large roots when digging. The amount of fertilization should increase or decrease according to the age of the tree and its growth. Combined with root pruning, put the weed green manure on each plant in the bottom of the ditch and then apply the base fertilizer, and mix it with part of the soil in the fertilization ditch. The fruit tree should be added with potash fertilizers such as plant ash fertilizer and potassium sulfate to facilitate flowering and fruiting.

3. The amount of fertilization. The annual fertilization amount is to produce 100kg of pure nitrogen and apply 0.6kg-0.8kg of pure nitrogen, and the ratio of nitrogen, phosphorus, and potassium is 1:0.4:1. Calculated on the basis of 2000 kg per mu, 12 kg of pure nitrogen, 5 kg of phosphorus and 12 kg of potassium should be applied per mu.

Citrus requires a large amount of fertilizer, but different fertilizers need to be selected according to different growth stages. Among them, the autumn basal fertilizer after the end of the picking period is particularly important. Organic fertilizer, microbial inoculants, water-soluble fertilizer and other fertilizers can be used for fertilization and top dressing.