Source: https://agriressources.fr/fileadmin/user_upload/Auvergne-Rhone-Alpes/177_Eve-agriressources/fertisols/RESSOURCES/Ameliorations/AFPF_Raisonnement_de_la_fertlisation_azotee_du_mais_fourrage__un_levier_pour_ameliorer_sa_production_et_sa_qualite.pdf