Analysis of heavy metal content in soil fertiliswith fresh and granulated digestate

Abstract

Our study analysed the content of selected heavy metals (Fe, Zn, Mn, Pb, Cd, Ni and Cu) in soils fertilised with mineral fertilisers (NPK and CaNPK), and fresh and granulated digestate. The content of the elements was compared with non-fertilised treatments (0 and control treatment). The maximum permitted limits were found not to have been exceeded in any of the treatments. The study demonstrated that the digestates under analysis were safe for use as fertilisers. The contents of Zn, Cu, and Mn after fertilisation with fresh digestate were found to be statistically significantly lower than in the control treatments. Following the application of the granulated materials, smaller quantities of Cu, Fe and Cd were noted.