Key points about citrus fertilization techniques

In addition to climate and soil, the production of high-quality citrus fruits requires the timely addition of necessary nitrogen, phosphorus, and potassium to nutrition, maintaining a certain tree vigor, 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.

In the case of nitrogen deficiency, the sugar content gradually increased with the increase of the application amount, but the excessive application of sugar decreased the sugar content. The acid content is exactly the opposite of the sugar content. Excess nitrogen fertilizer has a high acidity. In the past, if the amount of fertilization was reduced, many orange cultivars were continuously cultivated in the past. Most of them exhibited better coloration, smoother skin, lower acidity, and improved quality. However, if they lose weight continuously, the lack of nutrient in the orange tree will cause the tree to weaken. , Yields decrease, size, annual results, and quality decline. The skin is usually more nitrogen fertilizer. If the amount of nitrogen applied is insufficient, the color of the pericarp will change rapidly, but the color will be light; if it is too much, the color will be thick, but the residual part will be green.

Phosphorus has a good effect on the differentiation of citrus flower buds, fruit quality, especially the reduction of acid. In the absence of phosphorus, orange trees have poor growth and development, and their quality deteriorates. Therefore, application at the time of phosphorus deficiency can improve fruit quality. Phosphorus fertilizer is not lacking when applied, it will hardly increase the phosphoric acid content of the tree, and it is difficult to see the effect of promoting the growth and development of the fruit and the quality of the fruit. Excessive amounts of phosphorus can impede the growth of fine roots, reduce the absorption of nitrogen, and cause the absence of trace elements such as copper and zinc.

The potassium-depleted 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 appear coarse and large, and the quality will be poor.

The lack or overdose of trace elements such as zinc, magnesium, manganese, etc. can be manifested in fruits and leaves, and affect the growth and development of orange trees, the quality of which can be reduced according to the lack of symptoms in one year.

The organic fertilizer is mainly used in autumn. If the application period is delayed till the spring begins, nitrogen fertilizers are released one after another. If there is a large amount of nitrogen fertilizer in the fruit enlargement period, the shoot growth cannot be stopped and the fruit quality will be reduced.

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