Sewage sludges contain high levels of organic N. If these residues are applied in excess to soils, there is the risk of polluting the groundwater with nitrate, a product of N mineralization. For this reason, one of the criteria underlying the determination of the maximum N application rate to soils is the crop available N. This paper presents the results of a 224 day laboratory leaching study on organic N mineralization of anaerobically-digested sewage sludges from two treatment plants, namely Franca […]