ABSTRACT
In some cases considerable sewage sludge dressings had been applied in selected field trials. A total of 84 soil and 171 plant samples from two universities (Bonn and Gießen) and from four Agricultural Research Institutes (Braunschweig, Bremen, Munich and Speyer) were sent to the Speyer Agricultural Experimental and Research Institute for analysis. The amounts of 1, 7 t dry matter/ha.year permitted by the Sewage Sludge Regulations were exceeded by as much as 200 times.
