TY - JOUR T1 - Accumulation of amino acids in some boreal forest plants in response to increased nitrogen availability JF - New Phytologist Y1 - 1994 A1 - Näsholm, T. A1 - Edfast, A-B. A1 - Ericsson, A. A1 - Nordén, L-G. VL - 126 ER - TY - JOUR T1 - Seasonal changes in amino acids, protein and total nitrogen in needles of fertilised Scots pine trees JF - Tree Physiology Y1 - 1990 A1 - Näsholm, T. A1 - Ericsson, A. VL - 6 ER -