1. Aarts H.F.M. 1996 Efficient Nutrient Management in Dairy Farming on Sandy Soils. Technical results of the experimental farm ‘De Marke’ for the years 1993/94 and 1994/95 AB-DLO Rapport no. 18, Praktijkonderzoek. Rundvee, Schapen en Paarden (PR), Lelystad.
2. Burnhill P. Chalmers A. Fairgrieve J. Owen L. 1997 The British Survey of Fertilizer Practice 1996.
3. A model to describe the pattern of availability of broadcast phosphorus fertilizer during the growth of a crop;Costigan;Plant and Soil,1987
4. GEnstat 5 COmmittee 1993 Genstat 5 Release 3 Reference Manual.
5. Phosphorus leaching from soils containing different phosphorus concentrations in the Broadbalk experiment;Heckrath;Journal of Environmental Quality,1995