Effects of GA3, NAA and PCPA on the Fruit Drop Rate and Quality of Ziziphus jujuba lZhanshanmizaor

Yang Wang, Tao Tao, Pan Liao, Qunxian Deng
2018 Proceedings of the 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018)   unpublished
This experiment studied the effects of different concentrations of gibberellius (GA3), naphthalene acetic acid (NAA), and 4-chlorophenoxyacetic acid (PCPA) on the fruit drop rate and quality of Ziziphus jujuba 'Zhanshanmizao'. The results showed that spraying NAA reduced the fruit drop rate of Z. jujuba 'Zhanshanmizao', and 10 mg/L NAA increased the fruit's intrinsic quality. With the exception of 10 mg/L GA3, the other concentrations of GA3 all increased the fruit drop rate of Z. jujuba
more » ... of Z. jujuba 'Zhanshanmizao', and the four concentrations of GA3 all decreased the appearance quality of the fruit. Spraying PCPA reduced the fruit drop rate of Z. jujuba 'Zhanshanmizao', but it also reduced the appearance and intrinsic quality of the fruit. Jujube (Ziziphus jujuba Mill.) is a native and specific tree of China [1], with beautiful fruit shape, bright color and rich nutrition [2, 3] . Due to its strong adaptability and good economic and ecological benefits, jujube trees have developed rapidly after Chinese Economic Reform and open up [4] . Z. jujuba 'Zhanshanmizao' is a good variety of fresh food of jujube, which has been cultivated in santai county for more than 200 years .In recent years, many scholars have applied plant growth regulators to fruit production to explore the effects on fruit drop rate and quality. Zhao [5] found that the length of grape spike treated with gibberellius (GA3) increased, and the fruit setting rate, fruit quality and morbidity were all significantly reduced. Chen [6] found 50 mg/L naphthalene acetic acid (NAA) can obviously improve the fruit vitamin C, soluble solid, the content of sugar, organic acid, and fruit weight. 50 mg/L GA3 can increase fruit weight and organic acids, but reduced sugar and vitamin C. Shi [7] found that the 4-chlorophenoxyacetic acid ( PCPA) of 25 mg/L and 50 mg/L could significantly increase the fruit setting rate, yield of sweet orange, increase the vitamin C, and sugar content of fruit. The production of Z. jujuba 'Zhanshanmizao' is serious and the quality is uneven. However, there are few studies on the related issues of Z. jujuba 'Zhanshanmizao'. In this experiment, different concentrations of GA3, NAA, and PCPA were sprayed during the expansion of Z. jujuba 'Zhanshanmizao' young fruit, in order to be able to screen out suitable growth regulator types and concentrations that can both reduce the fruit drop rate of Z. jujuba 'Zhanshanmizao' and maintain its good quality, which will provide a scientific basis for sounding Z. jujuba 'Zhanshanmizao' production. Materials and Methods Materials. The test site is located at Z. jujuba 'Zhanshanmizao' Experimental Park in Yongxin Town, Santai County, Mianyang City. The soil in the park is loamy and well managed. The test material were 10-year-old jujube trees with spacing of 2 m × 3 m. Different concentrations of GA3, NAA, and PCPA were sprayed at 9:00 am on sunny days during the puffing period (June 17 th, 2017). The concentration of GA3, NAA, and PCPA was 0 mg/L (clear water), 10 mg/L, 20 mg/L, 30 mg/L, and 40 mg/L. All the fruiting groups of each tree were selected and listed. Each treatment was repeated 3 times. The other management measures are consistent with the local cultivation management of Z. jujuba 'Zhanshanmizao'. After separating the adjacent plants 7th
doi:10.2991/iceep-18.2018.248 fatcat:ww2c3eevvfbg5pcra75rqucmua