Changning's geographical and ecological environment and climatic soil conditions have produced the sweet and lingering characteristics of Changning's bitter bamboo shoots. Changning's bitter bamboo shoots can be said to be crispy, delicate and bitter, sweet and smooth, compared with Zhejiang, Fujian, Guizhou, Yunnan and The bitter bamboo shoots growing in other areas of the province are unique. At the same time, because of its pure natural green food and rich in dietary fiber, it is well received by consumers.

Over the years, Changning's bitter bamboo shoots have enjoyed a wide range of national reputations for their unique qualities. In 2004, Changning's bitter bamboo shoots won the title of “Yibin City Consumers' Favorite Goods”; In 2007, Changning's bitter bamboo cultivation technology won the Yibin Science and Technology Progress Award; in 2012, Changning's bitter bamboo shoots won the title of Yibin “famous specialty” and obtained Sichuan Province. The first batch of forest food base certification; in 2015, the “Jingzhen” brand bitter bamboo shoot produced by Sichuan Changning County Sentai Forestry Co., Ltd. was awarded the title of “Famous Special New” Agricultural Products of Yibin City and “Lushan” Brand of Changning County Lushan Food Co., Ltd. It has been recognized as a well-known trademark in Yibin City. With the development of local economy and the construction of global tourism, Changning's bitter bamboo industry has gradually developed and grown. Changning's bitter bamboo products have become the main tourism products of Changning, which are sold well in the country, Hong Kong, Macao, Taiwan and other places, and even exported to Southeast Asia, Japan,

Changning bitter bamboo shoots quality technical requirements First, the variety of bitter bamboo (commonly known as "sweet bitter bamboo shoots"). Second, the site conditions Suitable for Changning climate ecological environment, the best elevation between 320m and 1200m, soil environmental quality in line with the relevant standards. The soil has a pH of 5.0 to 8.0, such as yellow soil and purple soil, and the soil layer has a thickness of 400 mm or more. Third, planting technology 1. Afforestation: (1) seedlings: should be dug into the forest bamboo bamboo mother bamboo, bamboo stalk diameter 2.0cm to 5.0cm, with 3 to 4 discs, whip length 10cm to 15cm, whip The length is 15cm to 30cm, the whip bud is strong, the bamboo whip has no mechanical damage, the bamboo joint is normal, and there is no pest. (2) Planting density: the planting slope is less than 15°, the afforestation density should be 56 plants/per 667m2 (mu), the plant spacing should be 3.0m×4.0m, and the afforestation density of slope 15° to 35° should be 74 plants/ For every 667m2 (mu), the row spacing is 3.0m×3.0m. (3) Afforestation time: The best time is from the end of November to the next February. (4) Planting method: artificially leveling along the horizontal step belt, the planting hole size is 40cm×40cm×40cm. First put the topsoil into the bottom of the hole, put it into the mother bamboo, the whip root stretches, layered and covered with soil, and the bamboo whip or root plate is flat or slightly lower than the hole surface. Where the weather is dry or the soil moisture is low, it is necessary to properly fill the water and then cover the soil. The thickness of the covering soil should be higher than the original soil depth of 3cm to 5cm, and the planting holes should be piled into a skull shape, and finally the surface layer is covered with a layer of loose soil to permeate the fixed root water. 2. Forest land management: (1) Young forest tending: water quality should meet the requirements of relevant national standards, water in forest land, timely trenching and drainage; before canopy closure, weeding and soil should be carried out every year from May to June and July to August. Secondly, the depth of loose soil is 5cm to 15cm. New bamboo shoots do not leave or keep a small amount of strong bamboo shoots. In the second year, we should promptly remove weak bamboo shoots, small bamboo shoots, bamboo shoots and diseased bamboo shoots. (2) Chenglin management: In the spring, bamboo shoots are selected, and the bamboo shoots are long bamboo. The retention rate is 30%. The winter will be simmered once, the depth of the shovel is 10cm to 20cm, and the old bamboo is harvested to clean the pests and bamboos. The bamboo and weak bamboos are planted at a density of 9,000 to 12,000 plants/hm2. Covered with woodland, covering a thickness of 15cm to 30cm, covering 60% moisture. 3. Fertilization: from February to March, the long bamboo shoots are applied, from May to June, the long-term whip is applied, and from November to December, the bamboo shoots are applied. The fertilizer is mainly composed of decomposed organic fertilizer, using the application The application or combined coverage measures are applied together, and the application amount is 1000kg to 2000kg per 667m2 (mu), and it complies with the relevant national standards. 4. Pest control: combination of forest management technology, physical control and chemical control, and in line with relevant national standards. Fourth, processing 1. The main processing process of clear water bamboo shoots: raw material processing → shelling → cleaning → splitting → canning → sterilization → cooling → storage. 2. Main processing steps of dried bamboo shoots: raw material processing → shelling → slicing → drying → bagging → storage. 3. The processing environment and processing technology should comply with relevant national regulations and standards. V. Quality characteristics 1. Sensory requirements: (1) The sensory requirements for canned bamboo shoots should meet the requirements of Table 1. Table 1 Sensory requirements for canned bamboo shoots in clear water Item Requirements Colors Bamboo shoots should be white, yellowish white or light yellow. The color of the same can should be more uniform and slightly shiny. The shape of the tissue should be fine and tender, the incision is relatively flat, and the shape is relatively complete; there are no split bamboo shoots and broken bamboo shoots; broken bamboo shoots and bald bamboo shoots, each bag does not exceed 5% of the net content. The taste is fresh, fragrant, tender, crisp, slightly fragrant, no mildew and other odors. Impurities No visible impurities. (2) The requirements of the dry bamboo shoots should meet the requirements of Table 2. Table 2 Sensory requirements for dried bamboo shoots Item Requirements Color The bamboo shoots are white or light yellow. Tissue morphology The structure is fine, the size is basically the same, the shape is basically complete, and the surface is dry. The taste has the unique aroma of bitter bamboo shoots, and the fragrance is slightly bitter and has no peculiar smell. Impurities No visible spots visible to the naked eye, no foreign matter. (3) The sensory requirements of fresh bitter bamboo shoots should meet the requirements of Table 3. Table 3 Sensory requirements for fresh bitter bamboo shoots Item Requirements Color Bamboo shoots should be white, yellowish white or light yellow, shiny. Organizational form The bamboo shoots are fresh and full, clean, the shells are tightly packed, the bamboo shoots are bright, and there are no insects, lesions or rot. The taste has the unique aroma of fresh bitter bamboo shoots, and the fragrance is slightly bitter and has no peculiar smell. Impurities No visible spots visible to the naked eye, no foreign matter. 2. Physical and chemical indicators: water bamboo shoots, dried bamboo shoots, fresh bitter bamboo shoots should meet the requirements of Table 4. Table 4 Physical and chemical indicators project Qingshui bitter bamboo shoots dry bamboo shoots fresh and bitter bamboo shoots moisture,% —— ≤ 25.0 —— solid content, % ≥ 50.0 —— —— coarse fiber % ≤ 1.0 ≤ 10.0 ≤ 1.0 crude protein% ≥ 1.2 ≥ 18.0 ≥1.8 Reducing sugar g/100g ≥0.4 ≥7.0 ≥0.8 Amino acid% ≥1.0 ≥12.0 ≥1.2 Iron mg/kg ≥1.2 ≥15.0 ≥1.5 Zinc mg/kg ≥1.5 ≥16.0 ≥1.8 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 the production of Changning bitter bamboo shoots may submit an application to the Changning County Quality and Technical Supervision Bureau for the use of the “Special Mark for Geographical Indication Products”, which shall be reviewed by the Sichuan Provincial Bureau of Quality and Technical Supervision and reported to the General Administration of Quality Supervision, Inspection and Quarantine for approval. The testing organization of Changning's bitter bamboo shoots is selected by the Sichuan Provincial Bureau of Quality and Technical Supervision in the testing institutions that meet the qualification requirements.