1. Association des fabricants d'engrais du Quebec (AFEQ ), 1987 . Guide de fertilisation . Montreal, QC, Canada, 133 pp.
2. American Public Health Association (APHA ), 1989 . Standards Methods for the Examination of Water and Wastewater (17th Edition). Washington, D.C.
3. Commission of the European Communities (CEC, and A. Cottenie ), 1979 . Agriculture-Workshop on Standardization of Analytical Methods for Manure, Soils, Plants and Water, Luxembourg, 57 pp.
4. Nutrient Losses in Surface Runoff from Winter Spread Manure