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In addition to climate and soil, the production of high-quality citrus fruits requires timely supplementation of nitrogen, phosphorus and potassium to nutrition, maintaining a certain tree potential, ensuring the normal growth and development of the tree, and achieving the goal of high quality and stable production for successive years. Fertilization affects the sugar content, acid content, peel color and floating skin of citrus fruits.
When the nitrogen fertilizer is insufficient, the sugar content gradually increases with the increase of the application amount, but the sugar content decreases when the application is too much. The acid content is exactly the opposite of the sugar content, and the acidity is high when the nitrogen fertilizer is excessive. In the orange orchard that has been continuously cultivated in multiple fertilizers, if the amount of fertilizer is reduced, most of the performance will be better in coloring, smooth skin, decreased acidity, and improved quality. However, continuous weight loss and insufficient nutrition of orange trees will cause tree weakness. , the output is reduced, the annual results and quality are reduced. The floating skin is usually the more nitrogen fertilizer that occurs. The coloration of the peel, if the amount of nitrogen is insufficient, the color is fast, but the color is light; in excess, the color is strong, but some green remains.
Phosphorus has a good effect on the differentiation of citrus flower buds, fruit quality, especially acid reduction. In the absence of phosphorus, orange trees grow poorly and their quality is reduced. Therefore, application in the absence of phosphorus can improve fruit quality. When the phosphate fertilizer is not lacking, it will hardly increase the phosphoric acid content of the tree, and it is difficult to see the growth and development of the citrus and the fruit quality. If there is too much phosphorus, it will hinder the growth of fine roots, reduce the absorption of nitrogen, and cause the lack of trace elements such as copper and zinc.
The potassium-deficient citrus peel is thin and smooth, with low acidity, small fruit and low yield. If the application of potassium is increased, the fruit will become larger and the yield will increase, but when it is too much, the fruit will be coarse and large, and the quality will be poor.
The lack or excess of trace elements such as zinc, magnesium and manganese can be manifested in fruits and leaves, affecting the growth and development of orange trees, and the quality is reduced, which can be applied once a year according to the lack of symptoms.
The organic fertilizer is mainly used in autumn. If the application period is delayed until the spring, the nitrogen fertilizer will be released one after another. If there is a large amount of nitrogen excess in the fruit expansion period, the growth of the new shoots cannot be stopped, and the fruit quality will decrease.
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