Long term drilling can change soil chemical properties. It refers mainly to P, K and Corg. concentration as well as acidity of surface layer of soil. The main reason for these changes is the superficial usage of mineral fertilizers and modification in plant root distribution. To qualify soil biological activity one can use many indicators - numbers of soil fauna, number of particular microorganism groups or soil enzyme activity. Among them mostly dehydrogenase activity should be considered. Its activity depends on soil chemical properties. That is why dehydrogenase should be regarded as a very sensitive indicator for all changes occurring in the soil environment.
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