Usually the effect of fertilizer in two years is mainly divided into two, namely post-harvest fertilizer and strong fruit fertilizer. The amount of fertilizer applied varies depending on the variety, age, tree potential, garden conditions, and soil conditions. Post-harvest fertilizer accounts for 30% to 50% of the annual fertilization amount. It is mainly organic fertilizer. It can be used with decomposed cake fertilizer and appropriate amount of compound fertilizer. It should be applied as soon as possible after fruit collection. The tree potential is obviously weak, and a small amount of pre-emergence fertilizer can be applied if the fertilizer application is insufficient after harvesting last year. The pre-emergence fertilizer should be combined with organic fertilizer and inorganic quick-acting fertilizer. The organic fertilizer accounts for more than 50% of the total fertilization amount. It should avoid excessive application of pre-emergence fertilizer, especially the excessive inorganic fertilizer, which causes the spring shoots to grow too much. The strong fruit fertilizer is compounded with organic fertilizer and inorganic fertilizer, and the application period is around mid-June. Under normal circumstances, according to the production of 2 tons per mu, 10 kg of nitrogen fertilizer, 6.5 kg of phosphate fertilizer and 10 kg of potash fertilizer can be applied.
If sufficient pre-emergence fertilizer is applied and organic fertilizers are dominant, the application rate of strong fruit fertilizer should be reduced. If the tree is weak, the strong fruit fertilizer will increase appropriately, or a small amount of strong fruit fertilizer will be added in the middle of July to the middle of August. For the orange trees with less results, the results are mostly rough and large fruit. Applying strong fruit fertilizer will make this tendency more obvious, and less or no strong fruit fertilizer can be applied.
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