During the Republic of China, Blackwater Watermelon was the essential fruit of the northeast warlord Zhang Zuolin, Wu Junsheng, Mongolian prince Zasaktu and other officials. After the liberation, the melon farmers in the Blackwater region inherited the tradition and carefully cultivated, so that the ancient melon seeds are constantly updated and improved. The watermelons produced are not only large, but also high-yield, precocious, fresh in color, sweet and delicious, resistant to storage, and black water. The reputation of watermelon is constantly rising, attracting many domestic and foreign merchants. In 1970, the largest watermelon planted in Wuyi Village of Heishui Town reached 24 kg. The Chun'an County Government mailed it to Chairman Mao. Therefore, Blackwater Watermelon was selected as a special product of Zhongnanhai, and it is a party and country. The leaders have quenched their thirst and treasured the national banquet and won the reputation of “Zhongnanhai Summer Renewal”.

Technical requirements for quality of black water watermelon 1. Variety Agricultural research No. 1, Leiguan No. 1, Lei Guan Ba, Huamei No. 7 and other varieties adapted to local ecological conditions. 2. Land conditions The soil type is loam or sandy loam soil. The total salt content in the soil is u003c0.1%, the organic matter content is ≥1.5%, the soil pH is 7 to 8.2, the soil layer thickness is more than 1 meter, and the gas permeability is good. Third, cultivation management Sowing period: mid to late April to early July. 2. 3. Fertilization: 666.7m2 (mu) per acre before application of fully decomposed organic fertilizer ≥ 4 000kg, nitrogen fertilizer (N) ≥ 6 kg, phosphate fertilizer (P2O5) ≥ 3 kg, potassium fertilizer (K2O) ≥ 7.3 kg. In the initial stage of the extension of the vine and the result of the combination of pouring slow seedling water per 666.7 square meters of the application of quick-acting nitrogen fertilizer (N) ≥ 3 kg, potassium fertilizer (K2O) ≥ 1.5 kg. 4. Pruning and vine: When the vine is more than 0.5m, the pruning begins, and then every 4 to 5 knots. 5. Keep melons and turn melons: keep the main vines second and third female knotted melons. Turn the melon in time and stop watering 10 days before harvesting. 6. Environmental and safety requirements: The use of pesticides, fertilizers, etc. must comply with relevant national regulations and must not pollute the environment. 4. Harvesting Harvested when the fruit reaches 8 to 9 mature. Five, quality characteristics Sensory features: melon crispy sand, sweet and juicy, refreshing, less fiber. 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 blackwater watermelon production may submit an application to the Quality and Technical Supervision Bureau of Weinan City, Jilin Province for the use of the “Special Mark for Geographical Indication Products”, which shall be reviewed by the Jilin Provincial Bureau of Quality and Technical Supervision and announced to the General Administration of Quality Supervision, Inspection and Quarantine for approval. . The statutory testing agency for black water watermelon is designated by the Jilin Provincial Bureau of Quality and Technical Supervision.