[Nitrogen leaching after application of nitrochalk and cattle slurry in crop rotation on sandy soil [long-term experimentation]]

abonos nitrogenados azote beta vulgaris bovin cattle danemark denmark dinamarca farmyard manure fertilidad del suelo fertilisation fertilizer application fumier ganado bovino gramineas graminee grasses hordeum vulgare inorganic fertilizers leaching lessivage du sol ley farming leys lisier nitrate nitrates nitratos nitrogen nitrogen fertilizers pradera temporal prairie temporaire rotation culturale rotational cropping sandy soils slurry soil fertility sol sableux suelo arenoso trifolium