Kaiyang selenium-enriched tea is not fermented tea, in which tea polyphenols and caffeine retain more than 85% of fresh leaves, chlorophyll retains about 50%, and vitamin loss is also less, thus forming green tea "clear green leaves, strong taste convergence" specialty.

The main producing area of ​​selenium-enriched tea is Kaiyang County, which is located in the hinterland of Langzhong. It has a long history, rich products and beautiful mountains and rivers. Kaiyang Phosphate Resources is known throughout the country and is known as the “China Phosphorus Capital”; the selenium-rich land is known as “the hometown of selenium-rich agricultural products in China”. Kaiyang is rich in selenium-rich rice, selenium-enriched green tea, selenium-enriched potato silk, selenium-enriched eggs and other original green foods. Among them, selenium-enriched tea has a legendary allusion as a royal tribute. The birth of selenium-enriched tea was closely related to two venerable Kaiyang people in the Qianlong period of the Qing Dynasty. One was Wu Zhankui, and the other was General Yang Wei. Xu Zhankui is a native of Kaizhou Hongpo (now Shuangyong Village, Shuangliu Town, Kaiyang County). Mei Shiqi is a native of Kaisangping (now Nangong, Weng Duo Village, Nanlong Township, Kaiyang County). The two liked to dance with guns since childhood. In 1765 (the 30th year of Emperor Qianlong), the same town Xie Shaozhen was admitted to the Wuju people. In order to prepare for the test and diligently practiced at home, Xu and Mei both thanked the teacher after hearing the news. From then on, they became brothers and brothers. Shi Qi is a brother. In 1778 (the 43rd year of Emperor Qianlong), shortly after the master Xie Shaozhen's high school Wujinshi, Xu Zhankui also took the test of Wujuren. In 1784 (the 49th year of Qianlong), Xu Zhankui went to Beijing to pass the test and directly participated in the presiding of Emperor Qianlong. The temple test, in the palace test, whether it is the martial arts test opening bow, the dancing knife, the horse arrow shooting ball, the step arrow shooting, the meteorite test skills, or the text test theory, the policy is extraordinary, immediately being Qianlong The emperor gave him a Jinwu Jinshi, and first gave the Royal Third Class guards (five products). After Xu Zhankui became the guardian of the emperor, he missed the brother of Mei Shiqi, who was studying martial arts with his own childhood. The two letters continued to come. Because the former guards could not take time off, Xu Zhankui came to see him in the capital and sent it to the brothers. The cost of the road is entangled. After receiving the letter and the toll from the younger brother who invited him to meet in Beijing, Mei Shiqi was very excited. He took a local specialty such as his hometown tea and rushed to Beijing. After Mei Shiqi went to Beijing, Xu Zhankui arranged for him to live in the Guild Hall of the People's Republic of China. Xu Zhankui liked to drink home tea from an early age, and brought the tea that his brother sent him to his place to drink. One day, Emperor Qianlong came to Xu Zhankui's residence. When he entered the door, he felt the tea smelling and rushing. He asked: "Which tea is this?" Xu Zukui replied quickly: "Return to the emperor, this is the hometown tea of ​​the minister, the brother of the minister. When Messi came to see the Weichen from his hometown, he brought it." Qianlong listened and laughed and said: "Ai Qing's hometown has such a good tea, and it is not a personal product." So Xu Zhankui hurriedly teased Qianlong, and Qianlong sighed and said: "Good tea, good tea, good tea in the world." Junchen, while tea, talked about the tea ceremony, and talked about Xu Zhankui’s hometown in the southwestern border and Xu and Mei’s martial arts since childhood. Although Mei Shiqi had extraordinary martial arts, he had to rely on selling art and selling tea because of his poor family. Supporting the family and so on. When Qianlong heard that Mei Shiqi was extraordinary in martial arts and was comparable to Xu Zhankui but could only rely on selling art for a living, Xu Zhankui took Meijin Palace to see him. Soon, Xu Zhankui took Me Shiqi into the palace to see him. When Qianlong saw Mei Shiqi's tall and tall figure, he had already loved it. He told him to perform several guns, sticks, knives and fists on the spot. Qianlong Longyan Dayue, immediately awarded Mei Shiqi as General Yang Wei (very a military officer), and asked the Mei Shiqi to specialize in tea in his hometown and southwest tribute. Since then, Mescher has become a general Yang Wei who specializes in tribute tea without a soldier. In the past few years, the tribute tea from the southwestern frontier has been honoured by the capital city. It is called a southern tribute tea or a Nankai tribute tea (distinguished from the northern Zhilizhou), and simply referred to as Nangong tea. . During Jiaqing's years, Mei Shiqi retired to his hometown and renamed his hometown Ma Sangping as Nangong, and renamed the river in his hometown to the Nangong River. Later, because of the famous name of Nangong tea, Nangong became one of the famous big markets in the Jiadao period. Mei Shiqi later died in his hometown and was buried in the Nangong River. In 1848 (28th year of Daoguang), his son had a tombstone. The title of the monument: "The Emperor invited the general tomb of the ancestors of the ancestors of the ancestors of the ancestors of the ancestors" There is a saying in the "Guiyang Prefecture, Guizhou Province, under the jurisdiction of the younger brother Sinan Gongchang", but the tomb has been stolen, but fortunately the tombstone is preserved intact. During the Daoguang period, Xu Zhankui also returned to the hometown of Hongpo as an ancestor to build a tomb, but unfortunately the Xu's tomb was stolen and severely. The only remaining grandfather Xu Dengyuan on the red slope still has the words "Sun Enci before the guardian Xu Zhankui". The tombstone system of Xu Zhankui’s Zhongwu Jinshi was given the gift of the former guardian and returned to his hometown.

Technical requirements for the quality of Kaiyang selenium-enriched tea 1. Variety suitable for the production of selenium-enriched tea with medium and small leaf tea varieties. 2. Site conditions: 900m to 1300m above sea level; soil yellow loam soil, soil selenium content ≥0.46mg/kg, soil pH 4.5 to 6.5. Third, cultivation management 1. Seedling: asexual breeding. 2. Colonization: The planting time is from early November to late March, and the planting density per hectare is ≤55000. 3. Fertilization: Apply more than 3,000 kg of organic fertilizer per hectare per year, and apply fertilizer according to the growth of tea trees. 4. Environmental and safety requirements: The use of pesticides, fertilizers, etc. must comply with relevant national regulations and must not pollute the environment. Fourth, picking spring tea is from early March to mid-May, and autumn tea is from early September to mid-October. Fifth, the processing technology 1. Process: fresh leaves → greening → greening → strip or 揉捻 → dry. 2. (2) Killing: The temperature is about 200 ° C to 250 ° C, and the moisture is 55% to 65%. (3) Rule: use the strip mechanism to 15% to 25% moisture. (4) 揉捻: Use manual or machine 揉捻. (5) Drying: moisture ≤ 7.0%. Sixth, quality characteristics 1. Sensory features: uniform shape, green color, pure aroma, fresh taste, green soup, and even bottom. 2. 3. Safety and other quality technical requirements: Product safety and other quality technical requirements must comply with relevant national regulations.

Apply to：
Producers within the scope of Kaiyang Selenium-enriched tea production may apply to the Kaiyang County Quality and Technical Supervision Bureau of Guizhou Province for the use of the “Special Mark for Geographical Indication Products”, which is reviewed by the Guizhou Provincial Bureau of Quality and Technical Supervision and reported to the General Administration of Quality Supervision, Inspection and Quarantine. Announced. The testing institution of Kaiyang Se-enriched tea is selected by the Guizhou Provincial Bureau of Quality and Technical Supervision in the testing institutions that meet the qualification requirements.