Study on the effect of exogenous application of calcium on soil cadmium form
In order to explore the effect of calcium on soil heavy metal Cd,four different calcifications were applied to the soil to study the effect of calcium on soil pH,bioavailability of soil Cd and chemical form of soil Cd.The results showed that with the application of calcium,the soil pH value gradually in-creased,and the soil gradually became alkaline.The application of calcium can promote the adsorption ca-pacity of soil to Cd,resulting in a decrease in the bioavailability of soil Cd,and the form of soil Cd gradu-ally changes to a stable state,and soil pH is significantly positively correlated with soil calcium content,soil oxidizable Cd and soil residual Cd.
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