Effect of Indirect Subsurface Dripper Discharge on Fruit Growth and Quality of Jujube
Background: Drought restricts the development of characteristic forestry and fruit industry, such as jujube in South Xinjiang, China. This problem could be addressed with some efficient water-saving irrigation methods. Particularly, Indirect Subsurface Drip Irrigation (ISDI) is an effective irrigation method for water-conservation. Dripper discharge is an important design parameter for such irrigation.
Methodology: To study the appropriate dripper discharge for jujube in South Xinjiang under ISDI, the influence of three dripper discharge levels (2, 3 and 4 L hG1 ) on the fruit growth and quality of jujube were quantitatively studied through field plot experiment.
Results: Results showed that dripper discharge affected on water transport in the wetting front and on the fruit growth and quality of jujube and the water use efficiency, the sugar content in fruit was the highest in the 2 L hG1 treatment, being 46.62% significantly higher than that in the 3 and 4 L hG1 treatments. The contents of organic acid and soluble protein of fruit in the 2 and 3 L hG1 treatments were significantly higher than in the 4 L hG1 treatment. Water use efficiency was also highest in the levels 2 L hG1 , being 3.44 kg mG3 increased by 14.29% compared with that of the treatment 4 L hG1 .
Conclusion: Small dripper discharge was conductive to promote the growth of jujube, improving the fruit quality and increasing the yield of jujube and water use efficiency, which was the appropriate dripper discharge for jujube.