Yan'an jujube, a wild species from the Loess Plateau, is non-polluting and pollution-free, with high nutrient content and is known as the “natural vitamin pill”. It is a good dual-use dried fruit.

Origin of the environment Yan'an City is located in the middle of the Loess Plateau in northern Shaanxi, Yanhe and Luohe upper and middle reaches, with an altitude of 1000-1400 meters. To the north of Yan'an is the Liangshan and Gully hills and gullies, the soil is dominated by loessial soil, and the south is the 塬lianggou area dominated by 塬. The soil is dominated by black earth, with some yellow loess soil. The gullies in the territory are vertical and horizontal, the threat of drought is large, the agriculture is widely harvested, and the output is low and unstable. It is a warm temperate half-temperature and cool climate. The rainfall is less severe in spring and drought, and there are heavy rains and hail in summer. The annual rainfall is 500-600 mm, mostly concentrated in summer, and the annual dryness is 1.0-1.2. The annual temperature is 9 to 10 ° C, the hottest month temperature is 22 to 24 ° C, the coldest month temperature is -6 to -7 ° C, and the annual extreme minimum temperature is -20 to -22 ° C. The annual accumulated temperature is 3100~3400°C, and the effective growing season is 140～155 days. The average initial frost is in mid-October, the final frost is in late April, and the frost-free period is 160-170 days. The annual sunshine is 2400-2500 hours. Jujube trees prefer a sunny, dry environment. Therefore, the soil climate in Yan'an is a suitable area for its growth. Morphological characteristics Jujube is a deciduous shrub or small tree plant of the genus Rhamnoides. 1 to 3 m high. Bark gray-brown, with longitudinal division; young branches green, with long branches and short branches. The shape of the long branch "Zhi" has a pair of thorns at the base of the branch, one needle is erect and the other is bent downward. Leaves alternate, leaf blade elliptic to ovate-lanceolate, apex shortly sately sately sately sately sately sately sately sately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessate In the leafhopper, it is alternate with the dragonfly. The stone fruit is nearly spherical. It is dark red when cooked, sweet and sour, with large nuclei and blunt ends. Flowering period from April to May, fruiting period from May to September. Hi-yang, dry environment. Very adaptable, resistant to alkali, cold, drought, and thin, but not resistant to cockroaches. Hills, mountains, ditch, roadsides, and wasteland can all grow. Quality characteristics Yan'an jujube four wild species from the Loess Plateau, rich in vitamins, citric acid and calcium, iron, zinc, magnesium and other trace elements and biologically active substances, known as "natural vitamin pills". Eat more jujube foods also have the effect of nourishing health care, brain and brain. Seeds contain jujube saponins A, B and so on. Sexually flat, sweet, sour, has the effect of nourishing the heart, soothing the liver, and sweating. Indications of insomnia, convulsions, physical weakness and sweating, neurasthenia, multiple dreams, sweat less dry mouth embolism. Yan'an jujube is the highest active ingredient in Chinese jujube species. According to the laboratory test of Peking University School of Pharmacy, Yan'an jujube nuts contain medicinal ingredients such as activated carbon and fatty oil. After purification, they can be made into new drugs for reducing blood pressure, improving cardiovascular function and regulating nervous system function, especially for jujube seed. The total saponin content of the ingredients is 1.1353%, and the intrinsic quality ranks among the best in China.

Yan'an jujube quality technical requirements (1) cultivation techniques. 1. Soil selection: The soil should be selected as the soil on the gneiss parent material of the earthy rocky hilly area or the loess and black loess; the soil with a pH of 5.5 to 8.5. 2. Planting density: 220 plants are planted in dense planting area, and the row spacing is 3×1 m or 1.5×2 m. 110 plants are planted in the ordinary garden, and the row spacing is 1.5×4 meters or 3×2 meters. The planting time is from late March to mid-April every spring. 3. Trimming: The young tree starts about 1 meter high, and the main pole is cut off 80 cm from the ground. 3 to 4 strong branches are selected from the 20 cm below the kerf, and the first main branch is cultivated to make it The radioactivity stretched around to form the first layer of crown; in the second year, 2-3 strong branches were selected from the jujube head that was issued in the same year, and the second layer was formed into a second layer of crowns; the third year was the same. Method to cultivate a third layer of canopy. The spacing of the layers is successively decreasing, the first layer is 50 cm, the second layer is 40 cm, and the third layer is 30 cm, so that the entire tree is kept at about 3 meters. 4. Fertilization: In autumn, winter and spring, mainly the fully decomposed farmyard manure is applied, and it is applied once every year before the deciduous to the next year. The fertilization in summer is generally carried out after the rain, so as to be rich in N, P and K. Mainly available quick-acting compound fertilizer. (2) Harvesting. From late October to late November, when the fruit is full of purple and red, it can be harvested. Use a bamboo pole to gently smear the fruit on a clean cloth, remove the debris, and put it in the bag. (3) Processing technology. 1. Drying: After collecting jujube, it should be spread in time to dry in a clean, hygienic, ventilated and sunny place. 2. Cleaning: Rinse with potable water. 3. Pulp core separation: using a special jujube meat removal machine. 4. Separation of kernels and nuts: using a special shelling machine. 5. Drying: Spread the nuts and core shells on separate sites. 6. Packing: The pulp, nuts and core shells are packaged separately according to the quality grade in special packaging bags. (4) Quality characteristics. 1. Sensory: purple or purple-brown, smooth and shiny surface. The air is slight and the taste is light. 2. Physical and chemical indicators: jujube fruit: total sugar (in terms of glucose) ≥ 30%, total acid (calculated as citric acid) ≥ 3%. Suanzaoren: 1000-grain weight ≥ 40 g, jujube saponin (A, B) ≥ 0.1%.

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Producers within the scope of protection of Yan'an jujube GI products may submit an application to the Yan'an Quality and Technical Supervision Bureau for the use of the “Special Mark for Geographical Indication Products”, which shall be approved by the General Administration of Quality Supervision, Inspection and Quarantine.