Abstract:

In order to improve the yield and quality of blueberry fruit, the author found that nitrogen was one of the most important mineral elements in the growth of blueberries. A field experiment was conducted to investigate the effects of nitrogen fertilization on the growth, yield and quality of 5-year-old northern highbush blueberries ‘Bluecrop’. Different nitrogen dosage was: no N 0 g/plant (CK), 10 g/plant (N1), 20 g/plant (N2), 30 g/plant (N3). The results showed that the yield per plant of N1 higher than CK by 3.5%, the same time, N2 and N3 was lower than that of CK. The phenolics and anthocyanins contents were the highest in N2, respectively of 1.51 mg/(g?FW) and 3.38 mg/(g?FW), higher than CK by 7.09% and 19% ,but the two contents of N3 were lower than CK. As glucose, fructose, and soluble sugar content increased with the nitrogen application rate, and showed an increasing trend. In conclusion, the application of N fertilizer on blueberry yield and fruit quality were tested significant effects, but had no significant effects on leaf nitrogen content. Within a certain range, N fertilization could significantly improve the fruit quality of blueberry.