Comparative Research of the Effectiveness of Organo-mineral Melioration on Heavy Metals Polluted Soil. I. Changes in Soil Acidity
Keywords:
heavy metals, organo-mineral melioration, soil acidity, contaminated soilAbstract
The purpose of this paper is to study the effect of application of theoretical calculated quantities organo-mineral lime mixture on heavy metals contaminated soils. A pot experiment was conducted with cabbage grown on naturally heavy metals contaminated soil from Zlatitsa region. Following products have been used as ameliorants: carbonate deposit, anthracite coal dust and peat. The activation of organic components in mixtures requires higher pH values, which were not achieved in the experiment. This is one of the possible reasons for the increased risk of co-existence and hydroxide ion of copper and zinc in soil. There is а need to adjust the theoretical value of the coefficient h = 0.8 cmol/ kg, reflecting the optimum amount of lime material to neutralize the acid groups of humus substances which are not involved in chelating. It was taken on the basis of developments concerning the behaviour of soil humic acids in the neutralization of its acidity without taking into account different colloid-chemical behaviour of additional humus materials.
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