Residual Soil Nitrogen Indicator.

Drury, C.F., Yang, J., DeJong, R., Huffman, E.C., Reid, K., Yang, X.M., Bittman, S., and Desjardins, R.L. (2016). "Residual Soil Nitrogen Indicator.", in Clearwater, R.L., Martin, T. and Hoppe, T. (eds.) - Environmental sustainability of Canadian agriculture: Agri-environmental indicator report series -- Report #4, Agriculture and Agri-Food Canada, Chapter 11, pp. 115-120.