Dandong chestnut is famous for its high quality. Its fruit is large, its color is white, its taste is good, it is not cracked, it is easy to process, and its comprehensive value is high. Its water content is about 40%, protein contains 5.7%~10.7%, fat%~7.4 %, starch is about 50%, and contains vitamin A, vitamin B1, vitamin B2, vitamin C and various minerals such as phosphorus, potassium, magnesium, iron, zinc and boron.

The habitat environment Dandong is located in the southeastern part of the Liaodong mountainous area. It belongs to the hilly area. The terrain is high in the north and low in the south, with a total area of ​​14 910 km2. The mountainous hills account for 72.4%, the plain valley area accounts for 14.6%, and the others account for 13%. The natural overview can be summarized. It is a warm and monsoon continental climate between the seven mountains and one half of the road, the half road and the manor. It is located between 123°22′ to 125°41′ east longitude and 39°43′ to 41°09′ north latitude. Affected by the Yellow Sea, the southern part of Dandong City has a maritime climate. The rainfall is abundant and humid throughout the year. It is the region with the most precipitation in northern China. The annual average precipitation is between 800 and 1 200 mm. The annual average temperature is 6~9 °C, the annual extreme maximum temperature is 33~37 °C, the annual extreme minimum temperature is minus 26~39 °C, the daily average temperature is below minus 10 °C, the cold period is about 60d, and the daily average temperature is higher than 25 The hot period of °C is about 20 days, the soil pH is 5~6, the organic matter content is 2%~3%, and the soil layer thickness is more than 40cm. Production Situation Dandong Chestnut is an advantageous economic forest tree species in the Dandong area. It is mainly cultivated on the mountain, and a very small number of cultivated flatlands have been developed in recent years. The total area of ​​chestnut has reached 10.33 × 104 ha, and the annual output has reached more than 3 × 104 t. The total number of chestnut plants has reached more than 65 million. Among them, more than 40 years of large trees were planted in the 1960s, with about 10 million plants; 20 to 30 years old chestnut trees were mainly planted in the 1980s, with more than 15 million plants; After the 1990s, the cultivation area of ​​chestnut in Dandong expanded rapidly. By 2002, the number of chestnut plants increased by more than 30 million in more than ten years. The main varieties are Jinhua, Yuewang, Danze, Liping, Youmao, Earth 60, 9113, 9210 and other more than 20 varieties. The area of ​​chestnut varieties reached 3.82 × 104 ha. The city's chestnut cultivation is spread throughout every township (town). There are 38 townships (towns) with an area of ​​over 10,000 mu. The most famous towns are: Hongqi Town and Lanqi Town of Fengcheng City. Dongtang Town; Chang'an Town, Tangchi Town, Cross Street Town of Donggang; Gulouzi Town of Kuandian, Daxitun Township, and Budayuan Township. The nutrient composition Dandong chestnut is famous for its high quality. Its fruit is large, white color, good taste, no cracking, easy to process, high comprehensive value, its pulp moisture content is about 40%, protein content is 5.7%~10.7%, fat% ~7.4%, about 50% starch, and contains vitamin A, vitamin B1, vitamin B2, vitamin C and phosphorus, potassium, magnesium, iron, zinc, boron and other minerals.

Dandong chestnut quality technical requirements (a) variety. Liao Li 10, Liao Li 23, Danze, Liping, Dafeng, 9113, Youmei, Guojian, Tu 60, Jinhua. (2) Site conditions. The protection range is between 50 and 500 meters above sea level, the soil pH is 5 to 6, and the organic matter content is ≥2.0%. (3) Cultivation management. 1. Seedling breeding: use non-quarantine pests and diseases, and the pure local chestnut seedlings are grafted and propagated as rootstocks. 2. Colonization: The planting time is mid-April, and the cultivation density is ≤1650 plants/ha. 3. Fertilization: It is mainly based on organic fertilizer and assists in the application of chemical fertilizer. The application rate of organic fertilizer is ≥7.5 tons/ha, and the fertilizer is appropriately supplemented according to the tree potential, and 30 to 50 grams of urea or compound fertilizer is applied per plant. 4. Trim: (1) The tree is happy. (2) Combination of winter shears and summer shears. (4) Harvesting and grading. Harvesting began in early September, and the collection was mainly based on picking up chestnuts. After harvesting, the wind was cool. The fruit is packed in grades. (5) Storage. If it is not listed immediately after harvest, it should be stored in sand or stored at a low temperature. When the sand is stored, the water content of the sand is about 8%. First, weave 5-10 cm thick wet sand at the bottom of the ditch. Put the chestnuts mixed with sand into the ditch, cover the cover soil about 30 cm, and pour it into the ridge. shape. The time of sand storage does not exceed the first half of April of the following year. The low temperature storage temperature is -2 ° C to 0 ° C. (6) Quality characteristics. 1. Sensory characteristics: The fruit has a triangular shape, ellipse or oblate shape, with a tip, reddish brown or light brown, smooth fruit surface; flesh yellow-yellow or light yellow, with aroma and fine texture. The average fruit weight of large fruit varieties was ≥16 grams, and the average fruit weight of medium fruit varieties was ≥11 grams. 2. Physical and chemical indicators: in the month after harvest, the water content of pulp is 38 to 45%, protein is 5 to 6%, fat is 4.5 to 4.8%, starch is 40 to 50%, and large fruit type is ≥16%. The fruit-type variety has a sugar content of ≥21%.

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Producers within the scope of protection of Dandong chestnut geographical indication products may apply to the Dandong Entry-Exit Inspection and Quarantine Bureau for the use of the \"Special Mark for Geographical Indication Products\", which is approved by the General Administration of Quality Supervision, Inspection and Quarantine.