Abstract: With annual grafted jujube seedlings (rootstocks were sour jujube) of two jujube varieties, ‘Yueguang' and ‘Fucuimi', as test materials, the growth and photosynthetic characteristics of the two jujube varieties in Tianjin were analyzed by measuring their heads, leaf growth indexes and photosynthetic indexes, with a view to provide references for their introduction and planting in Tianjin area. The results of the study showed that the length and thickness of the jujube heads of both jujube varieties showed a “double S-shaped” growth curve with two growth peaks throughout the growth period, both around the 18th day. ‘Yueguang' reached its second growth peak around the 65th day, and ‘Fucuimi' reached its second growth peak around the 60th day. Both varieties stopped growing around the 110th day（late August）. The annual growth rate of head length and thickness of ‘Fucuimi' was significantly higher than that of ‘Yueguang'. During the whole growth period, the average growth rate of length and thickness of jujube heads was higher in ‘Fucuimi' than in ‘Yueguang'. The leaf water content and leaf thickness of ‘Fucuimi' were significantly higher than ‘Yueguang'. The leaf shape index of ‘Yueguang' was significantly higher than that of ‘Fucuimi'. The photosynthetic indexes of both varieties were not significantly different. The comprehensive analysis concluded that ‘Fucuimi' is more adaptable than ‘Yueguang' in Tianjin area.

Key words: jujube, treelet, growth, photosynthetic characteristics