Linzhi County (now Bayi District) in Tibet has a rich history of walnuts for thousands of years. It is planted in the fields and in front of the house. The seven thousand or eight-year-old trees are everywhere, and the landscape is unique. There are more than 10 varieties of ghee walnut, sparrow walnut, iron walnut, etc., which are famous for their thin skin, large size, tender meat, full flesh and flavoury sweetness. It is a tribute of the Dalai Lama and the Daguan of the past. It can complement the brain fitness. It is an excellent dried fruit and an important Chinese herbal medicine. At the same time, the walnut wood is fine and solid, and the texture is beautiful.

Linzhi walnut is mainly distributed in Nyingchi County, which is called Jiangnan in Tibet. It is concentrated between 3100-3300 meters above sea level. It blooms from late April to early May and matures in mid-September. The three mountains are located in the west, north, east and three sides of the Nyingchi area. The terrain is north-high and low-lying. The southeast is just facing the Indian Ocean and the Pacific Ocean. The warm currents of the two oceans sneak into the river all the year round. The region has a special tropical humid and semi-humid climate with an annual rainfall of 650 mm, an annual average temperature of 8.7 ° C, an average annual sunshine of 2022.2 hours, and a frost-free period of 180 days. 1. Walnut kernel contains more protein and unsaturated fatty acids necessary for human nutrition. These components are important substances in brain tissue metabolism, which can nourish brain cells and enhance brain function. 2. Walnuts prevent arteriosclerosis and lower cholesterol. The role. In addition, walnut can also be used to treat non-insulin-dependent diabetes mellitus. Walnut has analgesic effect on cancer patients, enhance white blood cells and protect liver. 3. Walnut kernel contains a lot of vitamin E, which is often used to moisturize skin and black hair. It can make the skin moist and smooth, and it is elastic; 4. When it is tired, chew some walnuts, it can relieve fatigue and stress. The pecan kernel is crispy and sweet, and the aroma is compelling. It can be used for pressing oil and fried food. It can also be used as a condiment for making sweets and cakes. Pecan nuts contain 7.8-9.6% protein, more than 7 kinds of essential amino acids and more than 25%, and 22 kinds of trace elements required by the human body, including calcium, magnesium, phosphorus, zinc and iron. Very rich. According to the data analysis, each kilogram of walnut kernel is equal to the nutritional value of 9 kilograms of fresh milk or 5 kilograms of eggs and 2 kilograms of beef, and it is more easily absorbed by the body than the nutrition of milk, eggs and beef. Walnut kernel also has the functions of moistening the lungs and tonifying the qi, nourishing the blood and relieving the asthma, moistening the phlegm and removing the phlegm.

Linzhi walnut quality technical requirements First, the variety of local butter walnut, egg walnut. Second, the site conditions 2900 to 3500m above sea level. The texture is sandy loam, the soil organic matter content is ≥1.2%, and the soil pH is 6.5 to 8.0. Third, cultivation techniques Seedling: Grafting or cultivating seedlings with ghee walnut as rootstock. 2. 3. Fertilization: mainly based on decomposed organic fertilizer, combined with application of chemical fertilizer and microbial fertilizer, the annual application of organic fertilizer to each adult plant is ≥15kg. 4. Environmental and safety requirements: The use of pesticides, fertilizers, etc. must comply with relevant national regulations and must not pollute the environment. Fourth, harvesting From late September to early October, the green peel began to harvest after cracking. Five, quality characteristics Sensory characteristics: thin skin, large, white, tender, full, sweet and mellow, light taste, high oil content. 2. 3. Safety and other quality technical requirements: Product safety and other quality technical requirements must comply with relevant national regulations.

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Producers within the scope of the Linzhi walnut production area may submit an application to the Linzhi Municipal Bureau of Quality and Technical Supervision for the use of the “Special Mark for Geographical Indication Products”, which shall be reviewed by the Quality and Technical Supervision Bureau of the Tibet Autonomous Region and reported to the General Administration of Quality Supervision, Inspection and Quarantine for approval. The testing organization of Linzhi Walnut is selected by the Quality and Technical Supervision Bureau of Tibet Autonomous Region in the testing institutions that meet the qualification requirements.