1. Anon, 1989. Storage of farm manures and slurries: Choosing a storage system. ADAS Leaflet P 3042, MAFF
2. Anon, 1991. Council Directive Concerning the protection of water against pollution caused by nitrates from agricultural sources. Official Journal of the European Communities (91/676/EEC) 8572/91
3. ASAE, 1993. Manure production and characteristics. In: Hahn, R.H., Rosentreter, E.E. (Eds.), Standards, Engineering Practices and Data. ASAE Data D384.1, American Society of Agricultural Engineers, pp. 530–531
4. Nitrate leaching loss following application of organic manures to sandy soils in arable cropping I Effects of application time, manure type, overwinter crop cover and nitrification inhibition;Beckwith;Soil Use Management,1998
5. Brooks, P.H., Carpenter, J.L., 1989. The water requirement of growing-finishing pigs – theoretical and practical considerations. Seal-Hayne Agriculture Faculty, University of Plymouth, Newton Abbot, Devon, TQ12 6NQ