Nitrogen in the soil and plant system of timothy leys situated in mountain areas of South-East Norway

azote farmyard manure fertilisation fertilizer application fumier highlands leaching lessivage du sol leys mineralisation mineralization mountain soils nitrification nitrogen noruega norway phleum pratense plant response plant soil relations pradera temporal prairie temporaire relaciones planta suelo relation plante sol respuesta de la planta soil treatment sol de montagne traitement du sol tratamiento del suelo