Normally, the effect of fertilizer in the year is mainly divided into two times, namely post-harvest fertilizer and strong fruit fertilizer. The amount of fertilizer varies depending on the species, age, vigor, garden conditions, and soil conditions. Post-harvest fertilizer accounts for about 30% to 50% of the annual fertilization amount. Organic fertilizer is the main fertilizer. A decomposed cake fertilizer can be used together with a proper amount of compound fertilizer. After fruit collection, it should be applied as soon as possible. The tree vigor is obviously weak, and if the post-harvest fertilizer application was insufficient in the previous year, a small amount of pre-fertilizer may be applied. Fertilizer before bud should be organic fertilizer and inorganic quick-acting fertilizer, organic fertilizer accounted for more than 50% of the total amount of fertilizer, should avoid excessive application of bud fertilizer, especially inorganic fertilizer, resulting in excessive growth of spring shoots. Strong fruit fertilizer with organic fertilizer and inorganic fertilizer, the application period is around mid-June. Under normal circumstances, the production of 2 tons per acre can be applied to 10 kg of nitrogen fertilizer, 6.5 kg of phosphate fertilizer and 10 kg of potassium fertilizer.
If sufficient pre-fertilizers are applied and organic fertilizers are predominant, then the application of strong fruit fertilizers should be reduced. If the tree tends to be weak, the strong fruit fertilizer will increase appropriately, or a small amount of promoting fruit fertilizer will be added in the middle of July to mid-August. For orange trees with a small amount of fruit, the results are mostly rough and large fruit. Application of strong fruit fertilizer makes this tendency more obvious, and less or no strong fruit fertilizer can be applied.
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