Wulong Pig Kidney Jujube

Wulong Pig Kidney Jujube

Wulong Pig Kidney Jujube is a geographical indication certification trademark.

Wulong Pig Kidney Jujube is a geographical indication agricultural product.

　　Produced in Yangjiao Town, Wulong County, Chongqing City, this is a local fresh-eating jujube variety that evolved through long-term cultivation and natural selection. Also known as Wulong Pig Kidney Jujube or Yangjiao Pig Kidney Jujube. The Yangjiao jujube has been famous for a long time, thriving since around the Tang Dynasty. With the completion of the riverside highway and the rapid development of tourism in Wulong, the reputation and market price of Yangjiao jujubes have risen sharply, making them highly favored by tourists. In 2009, the Yangjiao jujube was officially named "Wulong Pig Kidney Jujube," and the Municipal Forestry Bureau also awarded Yangjiao Town the title "Hometown of Jujubes in Chongqing." It boasts excellent taste and high yield, and is highly popular in the Chongqing and southwestern markets.

　　The cultivation of Wulong Pig Kidney Jujube has a long history. Historical records indicate that in 659 AD, Tang Dynasty Grand Tutor Changsun Wuji, who opposed Empress Wu Zetian’s ascension, was exiled to Qianzhou (now Pengshui County), where his diet included a record of consuming one liter of jujubes per month (see *Wulong County Annals* and *Pengshui Miao-Tujia Autonomous County Ethnic and Religious Annals*). This shows that local farmers had the habit of planting jujube trees over a thousand years ago. According to elders living near the tomb of Changsun Wuji (now in Jiangkou Town, Wulong County), there used to be many ancient jujube trees around the tomb, so large that two people could not encircle them. Forestry department surveys show that Wulong County currently has about 40,000 native Wulong Pig Kidney Jujube trees, including more than 1,000 mature trees over 100 years old. In Geling Village, Yangjiao Town alone, there are 82 jujube trees with a trunk circumference of over 1.5 meters. The largest of these is over 1,000 years old, with a trunk circumference of 2.33 meters, a height of 25 meters, an east-west crown diameter of 10.2 meters, a north-south crown diameter of 10.5 meters, and an annual yield of over 150 kilograms. Locals call it the "Thousand-Year Jujube King." The Wulong Pig Kidney Jujube is a valuable and superior local jujube germplasm resource in China. It is an early-maturing, fresh-eating jujube variety formed through long-term natural selection and careful breeding by local people. Its fruit is cylindrical, with a wide shoulder, slightly slender waist, and slight concavity, resembling a pig kidney (locally called "kidney" as "waist"). Hence, it is named Pig Kidney Jujube. This variety features vigorous growth, strong adaptability, high natural fruit set rate, abundant yield, and excellent fruit quality. On September 26, 2006, it was designated as an approved tree variety by the Chongqing Municipal Tree Variety Approval Committee (Chongqing Forestry Bureau Announcement 2006 No. 2, Code: Yu S-SV-ZJ-008-2006). Now, Wulong Pig Kidney Jujube is being vigorously promoted as a specialty economic forest variety across the county and in some surrounding districts and counties.

　　Product Quality Characteristics

　　1. External sensory characteristics: The fruit is cylindrical, slightly slender at the waist, with a wide shoulder, resembling a pig kidney (locally called pig kidney), with a protruding apex. The peel is brownish-red and shiny. 2. Internal quality indicators: The skin is thin, the flesh is thick, the pulp is greenish-white, crisp, honey-sweet, and rich in flavor. The stone is long spindle-shaped with sharp tips at both ends. Moisture content ≥68%, soluble solids ≥22%, edible rate ≥93%. 3. Safety requirements: Compliant with the *Pollution-Free Food—Deciduous Stone Fruits* (GB18406.2) standards.

　　Geographical Scope

　　The protected geographical indication area for Wulong Pig Kidney Jujube includes 15 townships in Wulong County: Yangjiao Town, Tukan Town, Xiangkou Town, Jiangkou Town, Baima Town, Changba Town, Huolu Town, Shiqiao Township, Baiyun Township, Pingqiao Town, Yajiang Town, Canggou Township, Fenglai Township, Miaoya Township, and Huangying Township. It spans from Datian Village in Canggou Township in the east, to Songping Village in Fenglai Township in the west, to Bajiao Village in Shiqiao Township in the south, to Shuangheyuan Village in Yajiang Town in the north. The geographical coordinates are between 107°34′40″ to 107°38′45″ east longitude and 29°21′05″ to 29°25′00″ north latitude, at an altitude range of 200 to 1,000 meters.