E. Salemi1, M. Mastrocicco1*, N. Colombani1, V.G. Aschonitis2 1 Department of Earth Sciences, University of Ferrara, Ferrara, Italy 2 Aristotle University of Thessaloniki, School of Agriculture, Thessaloniki, Greece mtm@unife.it   Abstract Nitrogen losses from non point agricultural sources, mainly originated by fertilizers’ application, have been recognized as one of the most serious threats for pollution […]