Nitrous oxide emmision following urea-N fertilization of wetland rice

agricultural chemicals application methods apport d'engrais arroz azote cereales cereals chemicophysical properties chemistry chimie chimie du sol crops cultivos cultivos de grano ecological soil types economic plants elements engrais environment environnement esparcido fertilizantes nitrogenados fertilizers gases gaz grain crops inorganic compounds medio ambiente methode methods nitrogen nitrogen fertilizers no metales nonmetals organic compounds organic nitrogen compounds oxides oxyde physical states plantas plante plante de culture plants produit agrochimique rice riz sales salts sel site factors soil chemistry soil physicochemical properties soil types sol de terres humides type de sol urea uree wetland soils