Huanglong Walnut is a specialty of Huanglong County, Yan'an City, Shaanxi Province. The local geographical environment is the best eugenic area suitable for the growth and development of walnuts. The huanglong walnuts produced are pure and fruity, with a large skin, a light, sweet, delicious and rich flavor. Loved by consumers.

Growing Environment Huanglong County is located at the junction of the Loess Plateau and the Guanzhong Plain. It covers an area of ​​2752 square kilometers with an average elevation of 1,100 meters. It is a temperate continental semi-humid monsoon climate with an annual precipitation of 602.7 mm and an average frost-free period of 158 days. It is a domestic eugenic area. It is the county with the most superior walnut production conditions, the largest planting area and the best yield benefit in the northern part of China. It is the only one in the northern part of the country that was awarded the title of “China's Walnut Township” by the State Forestry Administration and the only quality inspection in the northern part of China. Approved by the General Administration as the county of the National Dwarf Walnut Standardization Demonstration Zone. Morphological characteristics Deciduous trees, up to 35m, bark gray-white, shallow longitudinal fissure, medullary lobes, young apex pubescent; 2-year-old branches often glabrous. Feather-shaped compound leaves 25-50cm long, 5-9 small leaves, 13 rare, elliptic ovate to elliptic, terminal lobes usually larger, 5-15cm long, 3-6cm wide, apex acute or apex The base is round or wedge-shaped, sometimes heart-shaped, with or without obtusely blunt teeth. The surface is dark green, glabrous, with only micro-hairs on the back and very short or absent. Inflorescences of males are 5-l0cm long, male flowers have 6-30 stamens, 萼3 lobes; 1-3 flowers of female flowers, 2-locate, red-red. The fruit is spherical, about 5 cm in diameter, grayish green. Glandular hairs when young, hairless when old, inner nut spherical, yellow-brown, irregularly fluted on the surface. Flowering period from March to September, fruiting period from August to September. Quality characteristics u0026quot;Huanglong walnutu0026quot; pure quality, full fruit shape, a large skin thin, full of color, crisp, sweet and delicious, rich in flavor, easy to take, no insects, sickness. And the nut fat content is 68.2%, the sugar content is 15%, the unsaturated fatty acid is 92.5%, which is 5.2%, 3% and 2.9% higher than other production areas, and is rich in 19 kinds of amino acids and multivitamins, calcium, iron, Phosphorus, zinc and other trace elements. Huanglong Walnut is a pollution-free natural green food and has passed the national organic food certification. Nutritional value Walnut has a high medicinal value and is widely used in traditional Chinese medicine. The motherland medicine believes that walnuts are warm, sweet, and non-toxic, and have the effects of strengthening the stomach, enriching the blood, moistening the lungs, and nourishing the gods. Huanglong walnut also has the following health functions: 1. Preventing cardiovascular and cerebrovascular diseases Walnut kernel is rich in unsaturated fatty acids, which can purify blood, remove blood vessel wall impurities, and consume saturated fat accumulated in the body, thus effectively preventing cardiovascular and cerebrovascular diseases. Second, the treatment of cholelithiasis The pyruvic acid contained in the walnut kernel can prevent the binding of mucin and calcium ions, unbound bilirubin, and can dissolve, subside and excrete. Therefore, patients with cholelithiasis may wish to insist on eating walnuts every day, which may save the pain of surgery. Similarly, walnut kernels can also be used to treat urinary stones. Third, anti-aging Vitamin E contained in walnut kernels, can protect cells from oxidative damage of free radicals, is recognized by the medical community as anti-aging substances, so walnuts have the name of "longevity fruit." Fourth, make up the brain to increase wisdom Eating walnut kernels can nourish the blood, increase appetite, black hair, hair is beneficial to the brain, is an adjuvant for the treatment of neurasthenia, can delay memory loss, with the effect of brain and wisdom.

Huanglong walnut quality technical requirements (a) varieties. Thin shell No. 1, No. 5, Shenglong No. 1. (2) Site conditions. Between 600 and 1730 meters above sea level, the soil pH is 6.5 to 8, and the soil organic matter content is ≥1.0%. (3) Cultivation management. 1. Breeding of seedlings: Using local walnut seedlings as rootstocks, breeding the cultivar without test pests and diseases for grafting and breeding. 2. Colonization: Planting time is from late October to mid-November, and in mid-late March, the planting density is 495 plants ≤ hectare. 3. Fertilization: Fertilization is carried out in a seasoned formula, mainly based on organic fertilizer, and chemical fertilizer is applied. The application rate of organic fertilizer is ≥7.5 tons/ha. 4. Plastic trimming: (1) The tree shape is a natural happy shape and an evacuated layered shape. (2) Mainly for winter shears, combining winter shears with summer shears. 5. Environmental and safety requirements: The use of pesticides, fertilizers, etc. must comply with relevant national regulations and must not pollute the environment. (4) Harvesting and grading. In early September, the fruit is fully matured and harvested. It is peeled off, rinsed, aired or dried in time. Bleaching agent is not allowed during the rinsing process. Nuts are packaged in different varieties and grades. (5) Storage. Store at room temperature for no more than 12 months without rancidity. (6) Quality characteristics. (1) Sensory characteristics: the inside of the nut is thin, the convenience is convenient, the seed coat is light, the suture is flat, the shell surface is clean, the nucleolus is full and the color is light. (2) Physical and chemical indicators: average fruit weight of project indicators, g≥10 kernel yield, %≥50 water content,%≤8 fat content,%≥60 protein content,%≥13.5 sugar content,%≥103. Safety requirements : Product safety indicators must meet the relevant regulations of the state for similar products.

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Producers within the scope of protection of Huanglong walnut geographical indication products may apply to the Quality and Technical Supervision Bureau of Huanglong County, Shaanxi Province for the use of “Special Marks for Geographical Indication Products”, which shall be reviewed by the Shaanxi Provincial Bureau of Quality and Technical Supervision and announced by the General Administration of Quality Supervision, Inspection and Quarantine. Approved. The legal inspection agency of Huanglong Walnut is designated by the Shaanxi Provincial Bureau of Quality and Technical Supervision.