TY - Generic T1 - Long term effects of ammonium sulphate on Calluna vulgaris Y1 - 1997 A1 - Uren, S.C. A1 - Ainsworth, N. A1 - Power, S. A1 - Cousins, D.A. A1 - Huxendurp, L.M. A1 - Ashmore, M.R. JF - Journal of Applied Ecology VL - 34 ER -