Nitrogen Use Efficiency.

Drury, C.F., Yang, J.Y., DeJong, R., Huffman, E.C., Kirkwood, V., Yang, X.M., and Reid, D.K. (2005). "Nitrogen Use Efficiency.", in Lefebvre, A., Eilers, W.D. and Chunn, B. (eds.) - Environmental Sustainability of Canadian Agriculture: Agri-Environmental Indicator Report Series. Report #2/L'agriculture écologiquement durable au Canada : Série sur les indicateurs agroenvironnementaux - Rapport n° 2, Agriculture and Agri-Food Canada (AAFC)/Agriculture et Agroalimentaire Canada (AAC), Chapter 9, pp. 69-75.