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Fig. 1. The dependence of soil Cu2+ activity, as expressed by the -log (Cu2+) or pCu, on total Cu in 20Y peat soil. The solid line is fitted to pCu measurements at 5 and 9 d after Cu addition (pCu = 12.98 - 2.30 log CuT, r = 0.997) and the broken line is fitted to the pCu measurements at the time of maize harvest (pCu = 11.63 - 1.81 log CuT, r = 0.994). Total soil Cu is symbolized by CuT in these equations. Error bars in this and subsequent figures display ±one standard deviation unit
