Discharge and nutrient losses from arable land in 1994/95 and a long-term review

agricultural soils agua superficial arable soils azote calidad del agua carga contaminante charge polluante eau souterraine eau superficielle environmental impact assessment fosforo groundwater leaching lessivage du sol nitrogen phosphore phosphorus pollutant load pollution by agriculture pollution par l'agriculture sol agricole sol arable suecia suelos cultivables surface water sweden water quality