Yanjiang mandarin orange has excellent quality, rich historical and cultural accumulation, and high market recognition. Due to specific soil, water quality, climate and other factors, through scientific cultivation, unique characteristics are formed. The fruit of Yanjiang mandarin orange is oblate, the shape is correct, the oil cell is fine, smooth and elastic, with early maturity, early coloration, moderate sweet and sour taste, consistent flesh and peel, rich fruit juice, pulp residue, rich flavor, moderate sweet and sour taste.

Yanjiang District has superior ecological conditions suitable for citrus growth. The unique climatic environment not only makes Yanjiang mandarin have quick acid reduction, solid acid-to-acid ratio, rich flavor and uniqueness, but also chlorophyll degradation and anthocyanin formation. Lead to the coloring of Yanjiang mandarin orange early and even. The fruit shape of Yanjiang mandarin is dignified, the skin is thin and smooth, and the color is bright; the taste is special, the tender slag is refined, the flesh and the peel are mature, and the market reflects well. Advantages of Origin Yanjiang is located in the shallow hills of the central Sichuan Basin, in the middle reaches of the Minjiang River, with an altitude of 350-450m. It belongs to the subtropical humid climate zone. It has four distinct seasons, no cold in winter, no hot summer and more night rain. Due to the blockage of the Yunnan-Guizhou Plateau and the Longquan Mountains, cold air activity was suppressed, and autumn rains rarely occurred. The Lancang River flows from north to south through the whole territory, forming a unique community climate, which not only makes the Yanjiang mandarin fast acid reduction, solid acid ratio, rich flavor and unique; and chlorophyll degradation, anthocyanin formation early, leading to Yanjiang mandarin is colored early and even. According to the research project of the Ministry of Agriculture in 1996, “Chinese citrus zoning and its improved varieties”: Yanjiang’s unique climate is the most suitable cultivation area for mandarin orange. Due to the unique climatic conditions, the mandarin oranges in the real estate areas of Chongqing, Hubei, Hunan, Shaanxi, Guizhou, Jiangsu and Zhejiang under the same type of climate have been matured for 15-20 days, 25 days earlier than Zhejiang. Beginning in early September each year, the coloring of Yanjiang mandarin orange is 40%, while the similar varieties in other areas are still dark green. Even the earliest mature Yunnan Yuxi mandarin orange is green when mature, and there is no color advantage of Yanjiang mandarin. Due to the rainy and foggy autumn in Chongqing, the ripening of mandarin orange is 5-7 days later than that of Yanjiang mandarin orange. The smoothness of fruit surface is not as good as that of Yanjiang mandarin. The mandarin produced in parts of western Sichuan is more acidic and matures later. The mandarin produced locally in Jiangsu, Zhejiang, Guangdong and southern Fujian can also be premature, but the coloration is poor, the uniformity is poor, and the solid acid is relatively small, showing a lighter juice flavor. Nutritional Values ​​The fruit of Yanjiang mandarin contains a variety of nutrients such as sugar, citric acid, vitamin C, protein, as well as carotene, vitamin P and other vitamins. The vitamin C content is 6 to 20 times that of apple. Citrus is not only rich in nutrients, but also has a beautiful color, strong aroma, moderate sweet and sour taste, and it is thought to be missed, but it is coveted and the food is sweet. Edible efficacy Yanjiang mandarin has a variety of effects such as regulating qi and strengthening stomach, dampness and phlegm, lowering qi, relieving asthma, dispersing pain, promoting appetite, hangover and anti-malaria. Eat oranges not only the body to supplement a variety of vitamins and inorganic salts and other nutrients with fitness benefits to promote growth and development, but also stomach and digestion, dampness and swelling, is the treatment of indigestion, spleen bloating, gas, and chest full. Drinking too much medicine and having the effect of cutting off malaria.

Quality technical requirements for Yanjiang mandarin orange (1) Variety. Xingjin, Rinan, and Miyamoto. (2) Site conditions. The soil is purple soil, the soil pH is 5.5 to 7.8, the organic matter content is ≥1.5%, the soil layer thickness is ≥40 cm, and the water table depth is u003e80 cm. (3) Cultivation management. 1. Breeding of seedlings: Using alfalfa or orange as a rootstock, harvesting scion from the robust maternal strains with pure varieties and no quarantine pests and diseases for grafting and breeding. 2. Cultivation techniques: (1) Colonization: The time is from February to March before the spring shoots sprout or before the autumn shoots from October to November. The number of permanent plants per hectare was ≤ 833. (2) Fertilization: The application of organic fertilizer is mainly applied, and the fully decomposed high-quality organic fertilizer is applied to ≥75 tons per hectare per year. (3) Plastic trimming: the tree shape is a natural happy shape and a variable main shape. Winter pruning combined with pre-flowering and summer pruning ensures that the canopy is ventilated and light. (4) Flower and fruit management: By thinning the flowers and thinning the fruit, the ratio of leaf to fruit is 30 to 40:1, and the fruit per hectare is ≤200,000. 3. Environmental and safety requirements: The use of pesticides, fertilizers, etc. must comply with relevant national regulations and must not pollute the environment. (4) Picking. When the fruit surface is more than 2/3, or the soluble solids of Xingjin, Miyamoto, and Nissan are ≥11%, ≥8%, ≥9%, respectively, the harvest can be carried out. The stored fruit is harvested 7 days to 10 days earlier than the fresh fruit. The “two-cut method” is used for harvesting, and harvesting is prohibited in rainy days and high temperatures. (5) Quality characteristics. 1. Sensory features: Item variety Fruit-shaped fruit color Peel taste Xingjin flat garden, correct orange or orange yellow smooth flavor, fine slag, juice rich Miyamoto flat garden, correct orange smooth flavor, slag, juice rich day Nan flat garden, straight orange smooth flavor, slag, juice rich 2. Physical and chemical indicators: Item size (g) Peel thickness (mm) Fruit transverse diameter (mm) Soluble solids (%) titratable acid (%) Jin 120-200≤3.0≥55≥11.0≤0.7 Palace 100-150≤2.8≥50≥8.0≤0.7 Ni Nan 100-150≤2.8≥50≥9.0≤0.73. Safety requirements: Product safety indicators must reach the national Product related regulations.

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The producers within the scope of protection of the geographical indication products of Yanjiang mandarin can submit an application for the use of the “Special Mark for Geographical Indication Products” to the Quality and Technical Supervision Bureau of Yanjiang District, Ziyang City, Sichuan Province, which is approved by the General Administration of Quality Supervision, Inspection and Quarantine.