1. Fertilization method: mainly soil fertilization combined with foliar fertilization. The methods of annular furrow application, strip furrow application, hole application and soil surface fertilization were adopted.
2. Fertilization for young trees: apply fertilizer thinly, mainly nitrogen fertilizer with phosphorus and potassium fertilizer, and apply fertilizer 5-6 times in spring, summer and autumn (March, May, June, July, September and 65438+February, and apply 0.4 kg of ammonium carbonate or 0.2 kg of urea to each plant each time. 1-3 young trees should be applied with pure nitrogen 100-400g every year, and the ratio of nitrogen, phosphorus and potassium is1.0: (0.4-0.5):1.0. Adult trees should be fertilized four times, that is, germination accelerating fertilizer, fruit protection fertilizer, fruit strengthening fertilizer and fruit picking fertilizer. Generally, the amount of fertilizer applied is 2-3 kg of chemical fertilizer and one load of manure. Fruit-keeping fertilizer 1-2 kg phosphorus and potassium fertilizer+1 kg chemical fertilizer; Strong fruit fertilizer 1-2 kg chemical fertilizer+1-2 kg phosphorus and potassium fertilizer; The fruit picking fertilizer (base fertilizer) is mainly organic fertilizer, and each plant is applied with 50- 100 kg organic fertilizer+1-2 kg chemical fertilizer.
Shatangju, formerly known as October Orange, is also called Sihui Shatangju. Because of its sweet taste, it is named Shatangju. Originated in Guangning and Sihui areas, it is a traditional local product of Deqing and Fengkai, and it is one of the main local citrus varieties. The fruit of Shatangju is oblate, with a tumor-like protuberance at the top and a depression at the umbilical end. It is orange in color, thin in wall and easy to peel. Shatangju, especially Shatangju produced in Sihui huang tian zhen, is delicious, extremely sweet, residue-free, and delicate in taste, which is really a good product. It is rich in vitamin C, calcium, fiber, a small amount of protein and fat; Rich in glucose, fructose, sucrose and malic acid; Citric acid and citric acid; Carotene and thiamine; Riboflavin, nicotinic acid, ascorbic acid; Calcium, phosphorus, magnesium, sodium and other essential elements of human body, sugar and orange taste sweet and sour, cold in nature, have the effects of regulating qi and resolving phlegm, moistening lung and clearing intestine, enriching blood and strengthening spleen. Shatangju is a traditional local product of Deqing, Huaiji, Guangning, Sihui and Fengkai, and is also praised as "a must" by Yangcheng Evening News.