Abstract
Photosynthetic CO2‐fixation, chlorophyll content, growth rate and nitrate reductase activity were used to examine the influence of NH+4‐N and NO−3‐N on Sphagnum magellanicum cultivated under defined conditions in phytotrons. NO−3‐concentrations up to 322 μM were found to be favourable. Increased NH+4 concentrations, however, resulted in growth inhibition and decreased chlorophyll content at concentrations ≧ 255 μM; e.g. 600 μM NH+4 caused a 20% reduction of nitrate reductase activity and net photosynthesis. For raised bog Sphagna an improved standard nutrient solution is proposed with the following ion concentrations (μM): 55 Na+; 17 K+; 95 NH+4; 22 Ca2+; 22 Mg2+; 2 Fe3+; 20 Cl−; 100 NO−3; 57 SO2‐4; 7.4 H2PO−4; trace elements: A‐Z solution (Hoagland) 50 μl 1000 ml−1; pH 5.8.
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