TY - Generic T1 - Aluminium concentration versus the base cation to aluminium ratio as predictors for aluminium toxicity in Pinus sylvestris and Picea abies seedlings. Y1 - 2004 A1 - Van Scholl, L. A1 - Keltjens, W.G. A1 - Hoffland, E. A1 - Van Breemen, N. JF - Forest Ecology and Management VL - 195 IS - 3 ER -