(i) Mineral nutrients for Shatang Orange: There must be 12 kinds of mineral nutrients: Nitrogen, Phosphorus, Potassium, (Major Elements), Calcium, Magnesium, Sulfur (Medium Elements), Zinc, Manganese, Iron, Copper, and Boron. Molybdenum, (trace element). Each nutrient has a certain function, and the lack of any kind of nutrients will affect the growth of citrus; on the contrary, if some of the nutrients are too much, it will have a toxic effect. On the other hand, various types of nutrients have their own inherent proportions and interactions. If the ratio is imbalanced (especially trace elements), adverse symptoms will occur, affecting yield or quality. These nutrients can be supplemented by applying various fertilizers (organic and inorganic fertilizers).
(b) Fertilization period of the result tree: The result tree is usually fertilized 4-5 times a year.
1. Spring shoot fertilizer: about 20 days (usually in February) of spring shoot sprouting, mainly available nitrogen fertilizer. However, young trees and fruit trees should be "see bud fertilization" to determine the amount of fertilizer to determine the amount of fertilizer, in order to control the length of spring tip easy to preserve fruit. The lime powder can be used to neutralize the acidity of the soil and spray some foliar fertilizer. Such as spraying 0.15% borax, 0.3% magnesium sulfate, 0.3% potassium dihydrogen phosphate, 0.3% urea, nutritional nucleotides and so on.
2. Xiehua small fruit fertilizer: the beginning of the application of Xiehua, application of compound fertilizer and urea, etc., more fruit is given more, less fruit less, can significantly improve the fruit set rate. General production of 25 kg, 0.2-0.4 kg of each compound fertilizer is appropriate. However, attention should be paid to controlling the germination of summer shoots. During the summer shoots, nutrients are supplied to young fruit and supplemented with top-dressing fertilizer.
3. Autumn Shoot Fertilizer: Cultivation Results The mother tree is the key point of fertilization in a year and should be 30% to 40% of the total amount of fertilization in the whole year. The quick-acting nitrogen fertilizer is the main factor and can be combined with the decomposed organic fertilizer. It is 10-20 days before the shoot is released. Apply. Fertilization should be combined with irrigation so that the autumn shoots can be drawn together. If bury peanut bran or dried chicken manure, it usually takes 40-60 days in advance to play the role of attacking shoots. The autumn shoot fertilizer can also be left as a small amount for the shoot fertilizer to be applied after the autumn shoots are germinated or turned green.
4. Flower Bud Differentiation Fertilizer: Generally applied before flower bud differentiation in November, the main buried fertilizer, organic fertilizer or compound fertilizer, the main role is to promote citrus flower bud differentiation.
5. Pre-harvest (post-) fertilizer: old trees, weak trees, many trees bearing fruit, late-maturing species (cucumbers, etc.) can be applied once before or after harvesting a quick-effect fertilizer to promote early restoration of tree vigor and reduce winter Deciduous leaves are good for flower bud differentiation. After the fruit is harvested, the entire garden will be used once. In particular, if the roots are shallow-watered, the soil will help protect the roots for the winter and increase the nutrient area and fertilizer.

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