[Objective] The impacts of spraying superoxide dismutase(SOD)

selenium-enriched fertilizer and thidiazuron to leaves on winter jujube quality of Zhanhua winter jujube were researched under the condition of open cultivation in Dali agricultural science and technology demonstration base of Shaanxi Academy of Science.[Methods] Fruit quality among different fertilizer treatments was determined by methods of olybdenum blue spectrophotometry

sodium hydroxide titration

ultraviolet spectrophotometry and so on.[Results] (1) Spraying SOD to leaves significantly increased the contents of soluble sugar and soluble solids

meanwhile reduced the contents of organic acids and vitamin C

and decreased the fruit density after 15 or 30 days been picked. It also remarkably increased the red degree of fruit during the picking period and also the red degree after 24 days been picked

which were contributive to early fruit coloration and to put fruit into market earlier

and to reduce the rotten fruit ratio. (2) Spraying foliar selenium-enriched fertilizer significantly improved the selenium and soluble sugar contents in the fruit

and reduced the contents of organic acids and vitamin C. (3) Spraying thidiazuron mixed foliar fertilizer increased the contents of soluble sugar

soluble solids and organic acids

and decreased fruit density after 15 days been picked. The fruit density after 30 days been picked was higher than that of the contrast. Also

it can defer fruit coloration and fruit marketing

prolong store and supply period before marketing

reduce the rotten fruit ratio

and increase economic benefit.[Conclusion] Spraying SOD

selenium-enriched fertilizer and thidiazuron to leaves had important influences on winter jujube quality. It improved fruit quality to a certain extent. The spraying of selenium-enriched fertilizer can improve the nutrition and health function of fruit; spraying of SOD or thidiazuron is more conducive to early or later marketing

prolongs supplying period

improves the economic benefit.