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A species of buttercup (A) is thought to be able to accumulate nickel in its tissues. A comparable spp. (B) is not an accumulator. Species A therefore may be useful for removing nickel pollution from the soil. Each species of buttercup were seeded into two separate plots, one of which had previously been treated with 3g of nickel sulphate per square meter. Watering and other variables were controlled in all the plots A month after germination, the populations were counted using quadrats of 1m2 and the following results were obtained: Species A B a. Untreated plot 486 plants in 6 quadrats 584 plants in 8 quadrats Treated plot 608 plants in 8 quadrats 115 plants in 5 quadrats |
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