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APA Citation
Qiu, S. J., He, P., Zhao, S. C., Li, W. J., Xie, J. G., Hou, Y. P., Grant, C. A., Zhou, W., & Jin, J. Y. (2015). impact of Nitrogen Rate on Maize Yield and Nitrogen Use Efficiencies in Northeast China. Agronomy Journal, 107, 305–313. http://access.bl.uk/ark:/81055/vdc_100099477420.0x000059