How to grow big green jujube?

How to grow big green jujube? Please introduce the characteristics of Daqingzao: late ripening, flowering from late August to late October, fruit ripening from mid-January to late February of the following year; large leaves, obvious foliage wrinkles; beautiful fruit appearance, large fruit, crisp sweetness and good flavor; average single fruit weight 164.6 grams; high yield potential, comprehensive characters better than the current main green jujube varieties "five thousand" and "honey" The content of soluble solids is 11.7%, the content of total acid is 0.22g / 100g, and the content of vitamin C is 45.3mg / 100g. After multi-site trials in Dongguan, Huizhou and Heyuan from 2005 to 2007, the characters are stable and consistent. The yield of Ziziphus jujuba was planted in Dongguan Botanical Garden, Boluo Yinong Farm and Heyuanfa Farm respectively from 2006 to 2007. The average yield per mu was 1900 kg in 2006 and 2008 kg in 2007. The yield of the plant is about 85 kg. Key points of cultivation techniques of Ziziphus jujuba: proper sparse planting of ⑴: planting 20 to 25 plants per mu; timely planting of ⑵ and reasonable pruning: planting time from March to April, low grafting and replacement of big trees should be carried out from March to May, and it is not easy to bear fruit in the same year; properly leave more fruiting main branches, remove terminal buds to promote growth of lateral branches when pruning, and cut off the branches with poor light in the crown in time. ⑶ rational fertilization: generally fertilized once in vegetative growth period, one month before flowering stage, young fruit stage, fruit expansion stage and harvest period; phosphate fertilizer may not be applied in young fruit stage and fruit expansion stage; phosphate and boron fertilizer should be applied once at the first flowering stage; ⑷ rational allocation of pollination trees: "Tianmi" and "Gaolang 3" bearing elongated fruit were selected as pollination trees, and one pollination tree was allocated for every 10 trees. ⑸ adopts technical measures to improve fruit quality: one is to formulate sweet cultivation techniques to improve sweetness, and the other is to use bagging technology to improve its appearance quality. Click to get more jujube planting techniques click to get more fruit planting techniques