Abstract:
【Objective】 To explore the demonstration and popularization of the simplified cultivation mode of "trunk shape" by comparing the simplified "trunk shape" of grey jujube with the conventional small-crown sparse-layer tree shape in the local area in the hope of laying a theoretical foundation for mechanized production and unified standardized cultivation mode.【Method】 The yield components of 5-6 years old grey jujube trees were investigated and analyzed by counting and statistics method for two consecutive years from 2017, and the quality of fruit was determined by routine methods.【Result】 In terms of yield components: The number of branch groups, secondary branches, jujube suspensions and jujube fruits in trunk-shaped tree were significantly lower than those in small-crown sparse-layer tree, and the yield of trunk-shaped tree was 4.71 kg/plant significantly lower than that in small-crown sparse-layer tree, and 5.74 kg/plant was significantly lower than that in small-crown sparse-layer tree. In terms of fruit traits: single fruit weight, pulp thickness and fruit firmness of upper, middle and lower layers of small crown sparse canopy of grey jujube were lower than that of trunk-shaped tree, and the higher the crown level, the better the fruit traits of this position, the trunk-shaped fruit shape index was 1.45, the small crown sparse layer shape was 1.54; single fruit weight, stone weight, fruit longitudinal and transverse diameter, fruit stone vertical and transverse diameter of two tree-shaped trees. The pulp thickness and fruit firmness of jujube suspension were the largest in the middle part, followed by the base part and the tail part, and the trunk-shaped fruit characters between different parts of jujube suspension were better than those of small crown and sparse layer. The contents of soluble sugar, reducing sugar, vitamin C and soluble solids in different layers of trunk tree were higher than those in small crown and sparse layer. The contents of soluble sugar, reducing sugar and soluble solids in fruit were in the middle of jujube hanging > the base of jujube hanging > the tail of jube hanging, while the content of vitamin C was in the middle of jube hanging > the tail of jube hanging > the base of jube hanging, and acid content could be titrated. The results showed that the base of jujube suspension > the middle of jujube suspension > the tail of jujube suspension, and the nutritional quality of the fruits between different parts of jujube suspension was better in trunk shape. In terms of fruit harvesting period, the contents of reducing sugar and titratable acid in both tree-shaped fruits were dry jujube > hang-dried jujube > fresh jujube, while the contents of vitamin C were fresh jujube > hang-dried jujube > dry jujujube.【Conclusion】 The small crown sparse layered tree crown of Chinese jujube has a large number of branches and a high yield, but its fruit quality is poor, while the simplified `trunk' tree crown has simple structure, less branches, and is convenient for mechanized operation, and the fruit quality is better with better commodity value, so it has the potential value of demonstration and popularization.