Heavy metal pollution of soil is usually related to human activities. Sites near mining activities or heavy industry are often highly contaminated with toxic metals. Besides, application of low-quality fertilizers contaminated with heavy metals, e.g. cadmium, increased metal content in top-soils (Lado et al., 2008). Such highly polluted soils are hardly usable for agricultural purposes, because the pollution can be transferred into the food chain. Heavy metals bounded in the soil are leachable, they…
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