Abstract: The fertilizer efficiency of seaweed compost fertilizer was evaluated by measuring soil physical and chemical properties, root parameters, nutrient absorption, fruit yield and quality of winter jujube（Ziziphus jujuba Mill. cv. dongzao） before and after fertilization. The results showed that compared with no fertilization, seaweed compost fertilizer could significantly improve soil fertility and increase soil microbial biomass carbon and nitrogen（P<0.05）. Compared with conventional fertilizer treatment, the application of seaweed compost fertilizer increased the root length density of 0~20 cm soil layer, root activity and fruit yield of the jujube tree, and significantly increased the contents of soluble solids, vitamin C, total sugar and soluble protein of jujube fruit（P<0.05）. It indicated that seaweed compost fertilizer could increase root growth and nutrient absorption of jujube trees by improving soil fertility and increasing soil microbial activity, and ultimately improve the yield and quality of jujube fruit.

Key words: winter jujube（Ziziphus jujuba Mill. cv. dongzao）, seaweed fertilizer, root activity, yield, quality