Rice cultivation in Tangyuan County has a history of nearly one hundred years. It is the main producing area of ​​China's cold green rice. It is one of the earliest counties in Heilongjiang to grow rice, and is also the birthplace of rice in the Sanjiang Plain.n“Good mountain and good water out of good rice”, Tangyuan rice has special quality and taste, which is inseparable from Tangyuan’s unique ecological environment, soil characteristics, irrigation water source, climatic conditions, variety and cultivation techniques. In recent years, Tangyuan rice can be seen in major trade fairs across the country, in the grain and oil wholesale markets and supermarkets in large and medium-sized cities. The staff said: "Even if it is the same variety, the rice in our soup rice and other places is absolutely different in terms of nutrients and taste." This also makes "Tangyuan Rice" have the reputation of "Nanwu" (Five Chang) "Bei Tang" (Tangyuan).

According to the "Tangyuan County", the history of rice cultivation in Tangyuan can be traced back to the 11th year of the Republic of China. The rice was planted by artificial water and planted to 9000 mu. In 1949, the rice planting industry developed rapidly. In recent years, with the continuous development and growth of the rice industry, Tangyuan County has focused on increasing agricultural production, increasing farmers' income, and sustainable agricultural development. Changing ideas and applying new technologies has accelerated the development of traditional agriculture to modern agriculture. The area has achieved breakthrough development and rice production has been greatly improved. At present, the county's rice planting area has reached 1.05 million mu, the total output of rice has reached 550,000 tons, and the output value has reached 1.87 billion yuan. The rice industry has become the pillar industry of the county. A number of well-known and hard-hitting brands have emerged. Among them, “Tangwang River” and “Wanmu Rice” have been rated as famous brand products and famous trademarks of Heilongjiang Province. Tangwanghe brand rice has been from 2005 to now. Has been rated as a famous brand in Heilongjiang Province. Tangyuan Rice has participated in the Harbin Fair, Qiqihar Green Expo and Beijing Green Food Exhibition Week for many times, and has been well received by consumers at home and abroad. Tangyuan rice has become synonymous with quality, nutrition, safety and green rice. Relying on resource advantages, Tangyuan County has made eco-efficiency cards and continuously enlarges and strengthens the rice processing industry, forming a chain of development and interlocking development industry chain, which promotes the coordinated development of the county economy. The county is one of the main rice producing counties in the province. “Tangwanghe” brand green food grade A rice, using Longjing No.8, the first high-quality rice in Heilongjiang Province, implements continuous planting and is well-known at home and abroad, with an annual output of “Tangwanghe” brand A-grade green food rice 100,000.

Technical requirements for quality of Tangyuan rice I. Variety range: High quality varieties such as Longjing 8, Longjing 31, Japonica 10 and Japonica 12 which are approved by the state, high quality, high yield, strong stress resistance and suitable for accumulative temperature conditions. Second, the geographical coordinates of the site conditions are located at 129°30'-130°59' east longitude and 46°30'-47°21' north latitude. The effective accumulated temperature is at 2450-2550 °C. The soil type of cultivated land is black soil, meadow soil, paddy soil and white soil. The thickness of the cultivated layer is ≥25cm and the pH value is 6.5-7. Third, cultivation management 1, germination: in early April, using intelligent germination chamber soaking seeds to promote germination, good buds, neat and consistent, the germination rate of more than 90%. 2, seedling: seedling time is from April 13 to 20, using plastic greenhouse drying technology. Artificially transplanted, 150g ~ 300g of buds per square meter, seedlings seedlings per square meter of buds of 600g ~ 750g. 3, transplanting: transplanting period: May 10 to 20, specifications: 9 × 3-4 inches, 3-4 basic seedlings per hole. The depth of the transplanting is no more than 2cm. 4. Field water and fertilizer management: ≥30 tons of fermented and fermented agricultural fertilizer per hectare, and once every three years. Applying pure nitrogen ≤80kg per hectare, phosphorus pentoxide ≤60kg, pure potassium ≤40 kg. 5. Environmental and safety requirements: The use of chemical fertilizers and pesticides must comply with the technical standards for green food production and relevant national regulations, and must not pollute the environment. Fourth, the harvest period is when 95% of the rice grains reach maturity, harvested at the end of September and early October. V. Processing rice → screening → stone removal → magnetic separation → glutinous rice → grain separation → rice milling → broken rice → color selection → polishing → inspection → packaging. Sixth, quality characteristics 1, sensory characteristics Tangyuan rice color is white, translucent, shiny. The rice tastes soft and palatable, and the surface of the rice has light. The meal is not saccharified and does not return to life. It can still maintain a good taste after cold. 2. Quality characteristics The amylose content is 15%-18%, the gel consistency is ≥75mm, and the protein content is 6%-8%. 3. Safety and other quality technical requirements Product safety indicators and other quality technical requirements must comply with relevant national regulations.

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Producers within the scope of Tangyuan rice production may submit an application to the Tangyuan County Market Supervision Administration for the use of the “Special Mark for Geographical Indication Products”, which shall be reviewed by the Heilongjiang Provincial Bureau of Quality and Technical Supervision and announced to the General Administration of Quality Supervision, Inspection and Quarantine for approval. The testing organization of Tangyuan Rice is selected by the Heilongjiang Provincial Bureau of Quality and Technical Supervision in the testing institutions that meet the qualification requirements.