N-fluxes and efficiencies on farms in Styria, Austria

ammonia ammoniac animal husbandry animal production azote cerdo cycle de l'azote exploitation agricole explotaciones agrarias farms ganado housing leaching lessivage du sol lisier livestock logement lysimeters mais maize nitrogen nitrogen cycle plant products porcin production animale productos de origen vegetal proteine proteins slurry swine vivienda zea mays