Ammonia emission factors for N fertilizers applied to two contrasting grassland soils

abonos nitrogenados ammonia ammoniac ammonium nitrate azote calcium nitrate grassland soils nitrate d'ammonium nitrate de calcium nitrato de amonio nitrato de calcio nitrogen nitrogen fertilizers reino unido soil sol sol d'herbages suelo suelo de praderas textural soil types tipos texturales de suelos type de sol textural united kingdom urea uree