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APA Citation
Haegele, J. W., Cook, K. A., Nichols, D. M., & Below, F. E. (2013). changes in Nitrogen Use Traits Associated with Genetic Improvement for Grain Yield of Maize Hybrids Released in Different Decades. Crop science, 53(4), 1256–1268. http://access.bl.uk/ark:/81055/vdc_100099931497.0x000044