Abstract
In pot experiments with a serpentine soil, increase in soil pH, whether produced by CaCO/sub 3/ or Na/sub 2/CO/sub 3/, was found to reduce Ni extractable by ammonium acetate and also that absorbed by oat plants. Laboratory studies were made of the recovery of Ni added to a granitic soil limed by either CaCO/sub 3/ or Na/sub 2/CO/sub 3/. Increase in soil pH was found to reduce recovery. The results of the experiments suggest that the reduction in toxicity symptoms and Ni absorption produced by liming of these serpentine soils in the field depends on a reduction in available Ni due to change in soil pH, rather than on the improved Ca status of the soil. In a peaty serpentine soil, there are indications that part of the Ni exists as a complex with the soil organic matter.
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