Submitted to: British Grassland Society Proceedings
Publication Type: Proceedings
Publication Acceptance Date: June 14, 1999
Publication Date: November 22, 1999
Citation: Pionke, H.B., Rotz, C.A., Sanderson, M.A., Stout, W.L., Sharpley, A.N. 1999. Nitrogen and phosphorus sources and their importance to pasture-based systems. British Grassland Society Proceedings. p. 13-21. Technical Abstract: The major nitrogen (N) and phosphorus (P) sources and resources in pasture- based dairy farms are identified and examined. This was done by applying a dairy-based whole-farm simulation model (DAFOSYM) to four scenarios representing different pasture-based dairy systems found in the UK and northeastern US. The four scenarios include major differences in fertilizer and supplemental grain feed inputs and milk production. The N and P results are presented in terms of inputs, outputs, and on-farm storages. The implications are presented and analyzed for managing pasture-based dairy systems now and in the future.