%0 Generic %D 1991 %T Nitrogen Uptake and Allocation by Calluna-Vulgaris (L) Hull and Deschampsia-Flexuosa (L) Trin Exposed to 15NH3 %A Dueck, T.A. %A Van der Eerden, L.J.M. %A Beemsterboer, B. %A Elderson, J. %B Acta Botanica Neerlandica %V 40 %P 257-267