It has been cultivated for more than 2,000 years. It is one of the origins of Chinese tartary buckwheat. The four mountain ranges of Huajialing, Lulushan, Heiyanshan and Jiangangshan above 2,300 meters above sea level have become bitter due to their special natural environment. Traditional buckwheat planting area. Bitter buckwheat only has a unique quality when grown in a unique natural environment above 2,100 meters above sea level. Bitter buckwheat grown in a special environment is known as the "king of the grain", and its health-care properties are in the "Compendium of Materia Medica" and "Therapeutic Materia Medica" It is recorded in the code.

Tongyu is the largest bitter barley producing area in the country and is known as the “hometown of bitter buckwheat”. In the history of Tongyu, bitter buckwheat often appears as a reserve crop, so bitter buckwheat is seen as a life-saving food. Today, tart buckwheat is made into tea and becomes a favorite drink of Dingxi people.

Technical requirements for the quality of the bitter buckwheat. 1. The variety of bitter buckwheat varieties such as the variety Yunxiao No.1. Second, the site conditions are 1400m ~ 2500m above sea level, the soil type is mainly black ramie soil, loessial soil, black loess soil, and the organic matter content of the tillage layer is ≥0.85%. Third, cultivation management Optional land preparation: The rotation period is more than 3 years, and the deep cultivation is carried out in spring and autumn. 2. 3. Sowing: Sowing in mid-May, sowing depth 3cm-5cm, 8 to 100,000 seedlings per acre. 4. Field management: when the height of the seedling is 7cm-10cm, the weeding and the seedlings are carried out; 5. Harvest: Harvested when 2/3 of the grain is ripe, ie the grain becomes brownish gray or black. Fourth, the quality characteristics 1. Sensory characteristics: the seeds are full, the size is even, the skin color is deep, and the grain surface is rough. 2. 3. Safety requirements: Product safety and other quality technical requirements must comply with relevant national regulations.

Apply to：
Producers within the scope of the bitter buckwheat production area may submit an application to the Tongzhi County Quality and Technical Supervision Bureau for the use of the “Special Mark for Geographical Indication Products”, which shall be reviewed by the Gansu Provincial Bureau of Quality and Technical Supervision and reported to the General Administration of Quality Supervision, Inspection and Quarantine for approval. The testing institution of Tongbai Bitter Wheat is selected by the Gansu Provincial Bureau of Quality and Technical Supervision in the testing institutions that meet the qualification requirements.