Plant analyses for determining nutrient requirements of crops

absorption de substances nutritives azote biomasa biomass biomasse calcio calcium cereales cereals contenido de materia seca crop yield cultivos de invierno culture d'hiver dry matter content facteur de rendement fertilisation fertilizantes nitrogenados fertilizer application fosforo inorganic compounds magnesio magnesium modele modelos models nitrogen nitrogen content nitrogen fertilizers nutrient uptake nutrientes nutrients nutrition des plantes optimization methods phosphore phosphorus plant nutrition potasio potassium rendement des cultures rendimiento de cultivos substance nutritive teneur en azote triticum winter crops yield factors yield forecasting