Fröschl, Lena; Pierrard, Roger; Schönbäck, Wilfried - In: Ecological Economics 68 (2008) 1-2, pp. 96-105
Selected measures in agricultural production are presented which reduce the national nitrogen soil surface balances and the nitrogen loads in the waters of Austria, Bulgaria, Hungary and Romania entering the Danube River. The measures are appraised empirically by calculating the ratio between...