Soil mineral-N content in agricultural soils in south-east Norway and the relationships with field characteristics

agricultural soils azote campo cereal crops champ chimie du sol cultivation cultivo cultivos de cereales cycle de l'azote escorrentia fields losses from soil mineralisation mineralization modele modelos models monitoring nitrogen nitrogen cycle noruega norway pratique culturale ruissellement runoff soil chemistry soil texture sol agricole textura del suelo textural soil types texture du sol tipos texturales de suelos type de sol textural vigilancia