Abstract
The paper aims to study the effect of fresh and aged biochar with different pyrolysis temperatures and metal resistant bacteria on the numbers of microorganisms and the dehydrogenase activity of meadow chernozem soils. The use of fresh biochar leads to an increase in the number of soil bacteria and suppression of dehydrogenase activity; after ageing biochar by incubation in the soil, dehydrogenase activity increases significantly.
Highlights
Biochar is a carbon sorbent that is made by pyrolysis of organic residues
The use of microorganism strains increased the numbers of copiotrophic and the protorophic bacteria by 29.3% and 36.8% respectively. (Table 1)
The analysis showed a decrease in dehydrogenase activity in the control sample and in the sample with the introduction of microorganism strains, which is explained by the lack of stimulation from the root system of the plants
Summary
Biochar is a carbon sorbent that is made by pyrolysis of organic residues. A key aspect of creating biochar is the raw materials and the pyrolysis temperature. Biochar creates new structures for microorganisms that ensure soil aeration and the use of mineral nutrition elements. One of the most studied and common groups of pyrolysis products are volatile organic compounds (VOCs). It is known that the content of these substances in biochar does not depend primarily on raw materials, but rather on the conditions for biochar production [1]. The negative influence of VOCs on microbial communities and plants is well established. That is why soil microbial communities undergo significant changes in the first months after the biochar application
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