The Effect of Sewage Sludge Used in the Cultivation of Corn Plants as Second Crop and Silage on the Macro Nutrient Elements in the Soil Journal title: ISPEC Journal of Agricultural Sciences Authors: Erhan GEZER, Fatih KONUKCU, Aydın ADİLOĞLU, Ali Rıza DİNÇER Subject(s): Agriculture, Multidisciplinary