A comparison of the leachable inorganic nitrogen content in organic and conventional farming systems

agricultura tradicional agriculture biologique agriculture traditionnelle azote clay soils crops cultivos danemark denmark dinamarca farmyard manure fertilisation fertilizer application fumier leaching lessivage du sol lisier nitrate nitrates nitratos nitrogen nitrogen content organic farming plante de culture rotation culturale rotational cropping sandy soils slurry sol argileux sol sableux suelo arcilloso suelo arenoso teneur en azote traditional farming