Soil nitrate profile and response of potatoes to fertilizer N in relation to time of incorporation of lupin (Lupinus albus)

abonos nitrogenados abonos verdes application rates azote choix de la date crop yield dose d'application enfouissement engrais vert enterrado green manures incorporation leaching lessivage du sol losses losses from soil lupinus albus nitrate nitrates nitratos nitrogen nitrogen content nitrogen fertilizers nutrient management peciolo perte petioles prince edward island rendement des cultures rendimiento de cultivos soil soil morphological features sol solanum tuberosum suelo teneur en azote timing trait morphologique du sol tubercule tubers