Zuoyun has a long history of bitter cultivation. Zuoyun Bitter is known as the “Oriental God Grass” and is known as “the first Chinese cockroach”. The left-winged bitter buckwheat grain is dark brown, taupe, and has a triangular or pyramidal triangular shape with three triangular and three grooves, the same groove and blunt edge. The bitter skin is about one quarter of the obsolete weight and the bitter length is about four to seven millimeters.

Zuoyun Bitter Geographical Indication Products Protection Area is Madaotou Township, Shuiyao Township, Xiaojingzhuang Township, Zhangjiachang Township, Sancha Township, Guanjiabao Township, Yuershan Town, Yunxing Town, Zuoyun County, Shanxi Province. 9 townships, such as the shop town, are now under the jurisdiction of the administrative area. Zuoyun County is located outside Yanmenguan, with a geographical position between 39°44′-44°15′ north latitude and 112°34′-112°59′ east longitude. It is located on the Loess Plateau, with hills rolling and gully vertical and horizontal. Loess hilly area. It is high in the southeast and northwest, and low in the middle. It is roughly divided into four geomorphological types, with Shishan District accounting for 11.3% of the total area, soil mountainous areas accounting for 28.8% of the total area, loess hilly areas accounting for 36% of the total area, and river basin areas accounting for 23.9% of the total area. More than 1,600 meters. Zuoyun County belongs to the semi-arid continental monsoon climate in the north temperate zone. From the monsoon and the alternating control of the Siberian and Mongolian plateau high pressure, Zuoyun's winter is cold and snowy, the spring is dry and windy, the summer is hot and humid, and the autumn is cool and gentle. The color alternates in the alternation of the four seasons. The annual average temperature is 6.1 ° C, the extreme low temperature is -29.5 ° C, the extreme high temperature is 34.5 ° C, and the daily cross is 13.0 ° C. The average annual rainfall is 399 mm. The light energy resources are abundant, the annual average sunshine hours are 2763.8 hours, the total solar radiation amount is 1424 cal/cm2, and the accumulated land temperature is 2395.9 degrees. The frost-free period is more than 120 days. The freezing period is generally from the beginning of November to the beginning of April, a total of 130-145 days. The rivers in Zuoyun County belong to the Yellow River and Haihe Rivers. The drainage area is 78 square kilometers and 1236 square kilometers respectively. The main rivers include Shilihe, Maying River, Yuanzi River, Chenjiahe, Danan River, Dagu River, Shanjing River and Mud River. The Shili River is the most in the county. The main river. Because bitterness is suitable for altitudes above 1200 meters, the frost-free period is more than 120 days, and the sunshine grows under sufficient natural conditions, so our county has the excellent natural growth conditions of Zuoyun Bitter. Zuo Yun has a long tradition of bitter cultivation. The Song Dynasty Golden Beach War was used as a military food and army, and later tribute to the royal family. According to China's medical book "Compendium of Materia Medica" records: bitter, bitter taste, cold, beneficial strength, continued spirit, eyesight, gas, wide stomach and stomach. Modern science has confirmed that bitter buckwheat is rich in various trace elements such as tartary buckwheat flavonoids, vitamins, and selenium.

Zuo Yun Bitter Quality Technical Requirements (1) Variety. "Heifeng No.1". (2) Site conditions. Sand loam or loam, soil thickness ≥130cm, tillage layer ≥20cm, soil pH value 7.3 to 7.8, soil organic matter content ≥1.4%. (3) Planting techniques. 1. Seed requirements: The seeds are air-dried 7 to 10 days before sowing. After 2 to 3 days of continuous drying, seeds are selected to remove empty grains, broken grains, glutinous grains, grass seeds, earth and stone and other impurities, so that the seed purity reaches 95% or more. . Soak for 10 minutes in warm water at 40 °C or soak seeds with 5% to 10% of ash to make the germination rate above 85%. 2. Fine seeding and strong seedlings: (1) Sowing period: Generally, planting is carried out in the middle and late May. (2) Seeding rate: The seeding amount per hectare is 45 kg to 60 kg, and the seedling density is 90 to 1.2 million. (3) Seeding methods: two kinds of seeding and spreading, mainly based on stripping, which is convenient for middle farming management. The strip is opened from 167cm to 200cm, the broadcast is 13cm to 17cm, and the blank is 17cm to 20cm. 3. Site fertilization: After harvesting, the stalk should be ploughed in time and then deep ploughed (20cm). Or in the early spring shallow tillage, the organic fertilizer is applied once, and the organic fertilizer is applied from 12,000 kg to 18,000 kg per hectare. 4. Harvesting and storage: When 70% of the seeds of the plant show the inherent color of the variety, harvesting begins. After harvesting, the seeds are air-dried to a moisture content of 9% to 12% and stored in storage. 5. Environmental and safety requirements: The use of pesticides, fertilizers, etc. must comply with relevant national regulations and must not pollute the environment. (4) Quality characteristics. 1. Sensory characteristics: the grain is dark brown or taupe, and the shape is a round triangular or pyramidal triangular shape with three triangular and three grooves, the same groove and blunt edge. 2. Physical and chemical indicators: The bitter buckwheat peel is 103 to 148 microns thick, the bitter buckwheat skin accounts for 25% to 30% of the fruit weight, the grain length is 4.21 mm to 7.23 mm, the 1000-grain weight is 12 g to 24 g, and the ash content is 1.5% to 2.0%. Selenium content ≥ 31.39μg/100g, protein content ≥ 16.23%, lysine content ≥ 0.83%, total flavonoid content ≥ 19.08mg / g. 3. Safety requirements: Product safety indicators must meet the relevant regulations of the state for similar products.

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The producers of the Zuoyun Bitter Geographical Indication Products Protection Area may apply to the Datong Entry-Exit Inspection and Quarantine Bureau for the use of the “Special Mark for Geographical Indication Products”, which shall be reviewed by the Shanxi Entry-Exit Inspection and Quarantine Bureau and announced by the General Administration of Quality Supervision, Inspection and Quarantine. Approved. The statutory testing agency of Zuo Yun Bitter is designated by the Shanxi Entry-Exit Inspection and Quarantine Bureau.