Abstract: With Blueberry (Blomidon) as the research material, we studied the effects of fertilization on the plant growth, chlorophyll fluorescence parameters and quality of the fruit of blueberry during full fruit period in Daxing'an Mountains to provide some basic data for optimizing the blueberry cultivation techniques in northern China. The fertilization could significantly promote the plant growth of blueberry, and the fertilization amounts of 7.5 g/plant had the most obvious promotion on the shoot length and crown width of blueberry, while the effects of different fertilization amounts on the shoot length and coarseness of blueberry showed no significant differences. Fertilization treatments also significantly promoted the actual photochemical efficiency, electron transport rate and the openness of PSII reaction Center in blueberry leaves, and energy distribution parameters of PS II reaction center in fertilization treated blueberry leaves were more prone to photochemical reaction, which also showed that fertilization amounts of 7.5 g/plant had the optimum effects on the chlorophyll fluorescence parameters. Fertilization treatment also changed the quality of blueberry fruit, although the contents of vitamin C and anthocyanin, and pH in blueberry fruit showed no significant differences under different treatments. However, total sugar content increased obviously, total acid content decreased gradually except 10 g/plant treatment, which showed that ratio of sugar/acid increased are is reduced trend, performance for than of increased, but 5 g/plant treatment was optimum for the quality of blueberry fruit, which was different from the fertilization treatment on the changes of growth and chlorophyll fluorescent parameter of changes of blueberry. Therefore, fertilization could significantly accelerate the growth of blueberry plant, improve their photosynthetic ability and fruit quality, but the factors of growth and quality of blueberry should be considered when fertilization amount was controlled.

Key words: blueberry, fertilization, growth, chlorophyll fluorescence, fruit quality