Magnesium from soil pollution point of view
2000
Kobza, J.
Content of available magnesium from medium to high is characteristic property of soils in Slovakia. It's content is running between 80 and 400 mg Mg/kg (relative backgroung) what is influenced by mineralogical composition of soils (mostly on limestones and dolomites) and particularly by liming. The content of available Mg more than 500 mg.kg-1 and especially more than 1 000 mg/kg significantly influence on the change of chemical properties and pH value of soils. This situation is permanently actual in the surroundings of magnesite factory in Hacava in spite of improved emission situation in this time. The content of available Mg in the most polluted zone is often more than 1000 mg/kg (max. value 20 500 mg/kg). Referring to this fact the alkaline pH value (more than 8, sometimes more than 9) and decrease of humus content as well as decrease of colour parameter of humus were determined. Finally, it will be necessary expect heavy metals to introduce the hygienic limit also for magnesium from the soil pollution point of view in the future. Namely, the evaluation of Mg content (as important nutrient for plants) according to valid criteria of UKSUP (1983) is not sufficient in this case
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