Winter jujube (also known as Yanlaihong, Apple Jujube, Rock Sugar Jujube, Lubei Winter Jujube, etc.) is a high-quality late-maturing fresh food species in northern Shandong.
Winter jujube bears fruit early, and it can bear fruit in the same year of grafting. 10 ripens in the first half of October, and the fruit is nearly round, with smooth and smooth surface, and the fruit shape resembles a small apple.
The longitudinal warp is 2.7-2.9 cm, the transverse warp is 2.5-2.9 cm, the average unit weight is 14 g, and the maximum fruit weight is 45 g. The skin is thin and crisp, sweet and slightly sour, and there is no residue after eating. The soluble solid content is about 38%, up to 42%, and the edible rate is 96.9%.
Winter jujube is suitable for fresh eating, with high quality and rich vitamin content. It has the reputation of "natural vitamin pill", and its vitamin C content is 400-600 mg/100 g, which is 0/0 times higher than that of citrus/kloc and 80 times higher than that of apple. The content of vitamin B is also extremely rich.
In addition, jujube is rich in protein and inorganic elements such as iron, calcium and phosphorus.
Winter jujube has strong adaptability, sandy loam and clay grow well and are resistant to salt and alkali.
At the same time, it is also one of the earliest fruit trees. After some varieties are grafted in the nursery, some plants bear fruit in the same year, which is extremely rare in other fruit trees. The fruiting rate of seedlings in the same year can reach 50-70%.
There is a saying in the fruit industry that "jujube will pay back the money in the same year", which means that jujube trees can bear fruit in the same year to recover the cost. Three-year-old jujube orchards are densely planted (2× 1 m or 2× 1.5 m), and the yield per mu can be as high as 1400 kg or more.
After entering the high-yield period, the yield per mu can be maintained between 2,500 and 3,500 kilograms, the output value per mu can exceed 10,000 yuan, and the normal fruiting period can reach 100 year.