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Cupric Ion Activity in Peat Soil as a Toxicity Indicator for Maize

Department of Crop and Soil Sciences, Cornell Univ., Ithaca NY 14853

View larger version (15K): [in a new window]   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

View larger version (20K): [in a new window]   Fig. 2. The dependence of total dissolved Cu (mg/L) and Cu2+ activity (pCu) in leachate on total concentration of Cu in peat soil

View larger version (19K): [in a new window]   Fig. 3. The dependence of maize shoot weight (yield) and soil pCu on the concentration of Cu added to the soil

View larger version (22K): [in a new window]   Fig. 4. The concentration of Cu and Fe in maize shoots as a function of Cu added to peat soil