Effects of Cyanamide on Phenological Period and Fruit Quality of ‘Dongzao’ Jujube Cultivated in Facilities

In the base of 6-year-old ‘Dongzao’ jujube was sprayed uniformly with different concentrations of cyanamide to observe the effects of cyanamide on phenology, internal and external quality of fruit. The results showed that 3% cyanamide had the best effect on promoting early maturity of ‘Dongzao’ jujube. Its germination period, early flowering period and full flowering period was 10 days, 11 days and 11 days earlier than CK respectively. Its final flowering period, white maturity period, crisp maturity period and red maturity period was 10 days, 9 days, 8 days and 9 days earlier than CK respectively. The effect of spraying 2% cyanamide was significantly better than that of 1% and 3% treatments on the appearance and internal quality of fruits, but the hardness of fruits decreased. The effect of different concentrations of cyanamide on the contents of soluble solids, total sugar, total acid and vitamin C of ‘Dongzao’ jujube was not significantly different from those of CK, and the inherent quality of ‘Dongzao’ jujube was maintained.