Long-term Effects of Sewage Sludge and Farm Slurries

Previous seminars organised by the working party under the auspices of the EEC Concerted Action havebeen devoted to the evaluation of the nitrogen, phosphorus and organic matter content of sewage sludges, almost invariably over the twelve month period of application. Depending on the type of sludge they havebeen shown to be useful sources of nitrogen, phosphorus and organic matter for grass, cereals and in landrestoration in terms of improving the physical properties of disturbed lands. However, distance from thetreatment work severely limits the radius of operation. Whereas it is of value to f.