Abstract: The effects of three growth regulators, including prohexadione calcium, paclobutrazol and uniconazole, on the growth of new shoots and fruit quality of 3-year winter jujube were investigated. With water as the control, three regulators of prohexadione calcium, uniconazole and paclobutrazol were sprayed, and nine treatments with three concentrations of 100, 300 and 500 mg/L were set, respectively. The shoots were sprayed twice during the growth period, and the growth of new shoots was observed by fixing the plant and branches. The quality of fruit was determined after ripening. The results showed that 100~300 mg/L of prohexadione calcium, uniconazole and paclobutrazol had an inhibitory effect on the growth of new shoot length, and prohexadione calcium had the best effect on the growth of new shoot thickness, and 100 mg/L of prohexadione calcium and uniconazole could effectively inhibit the growth of new shoot internode. The chlorophyll SPAD value of each treatment increased. The tree growth control effect of the three kinds of regulators was better than that of the control group, and the comprehensive index of 300 mg/L prohexadione calcium treatment was the best, which could promote the thickening of new shoots, inhibit the vigorous growth of new shoots, and increase chlorophyll content and single fruit weight to improve fruit quality.

Key words: winter jujube cultivated in facilites, growth regulator, new shoot, fruit quality