The ponkan is a kind of mandarin, a traditional specialty fruit of Wenzhou. Wenzhou is cultivated all over the country, because Wenzhou is called the Yueyue and hence its name. The ripe ponkan is golden yellow. It tastes slightly bitter and then sweet when consumed. It has a special aroma.

Technical requirements for citrus quality (1) Site conditions. Below 300m above sea level, the soil type is paddy soil or red loam soil, the soil layer thickness is ≥70cm, the groundwater level is below 80cm, the pH value is 5.5 to 7.0, and the soil organic matter content is ≥1.5%. (2) Nursery and construction. 1. Seedlings: Take the scion from the saplings of the saplings, and choose the scorpion and the scorpion to graft and propagate. 2. Construction: Planting on flat land should be planted with piers, planting density ≤1600 plants/ha; mountain planting should be built with horizontal terraces, the width of the ladder should be more than 3m, and the planting density should be ≤1900 plants/ha. 3. Planting time: spring planting or autumn planting. (3) Cultivation management techniques. 1. Fertilization management: based on organic fertilizer, supplemented with inorganic fertilizer, the application of high-quality organic fertilizer is not less than 30 tons / hectare per year. 2. Plastic pruning: The tree shape adopts natural happy shape, and the combination of winter pruning and summer pruning balances the canopy to improve ventilation and light transmission conditions. 3. Flower and fruit management: bud stage flower thinning, after fruit setting, the ratio of leaf to fruit is ≥60. (4) Harvesting and storage. 1. Harvesting period and method: Pick up the fruit in time before and after the light snow in late November each year, and pick it with two special scissors. 2. Storage: After harvesting, it must be pre-stored for 40 days to be available for sale. (5) Quality characteristics. 1. Sensory characteristics: fruit shape is correct, fruit diameter ≥ 50mm, peel color orange yellow or golden yellow, peel and pulp are tightly combined, easy to peel, soft pulp slag, slightly bitter. 2. Physical and chemical indicators: soluble solids ≥ 11%, total acid ≤ 1.0%, edible rate ≥ 65%.

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Producers within the scope of protection of citrus GI products may submit an application for the use of “Special Marks for Geographical Indication Products” to the Bohai Branch of Wenzhou Municipal Bureau of Quality and Technical Supervision, which is approved by the General Administration of Quality Supervision, Inspection and Quarantine.