The STICS model to predict nitrate leaching following agricultural practices Nathalie Schnebelen, Bernard Nicoullaud, Hocine Bourennane, Alain Couturier, Bernard Verbeque, Christian Revalier, Ary Bruand and Emmanuel Ledoux Agronomie, 24 6-7 (2004) 423-435 DOI: 10.1051/agro:2004039