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Microbial structure of nitrogen utilizers in Populus nigra L. compost and vermicompost E. Kornievskaya, A. V. Kurovsky, A. S. Babenko [et al.]

Contributor(s): Kurovsky, Alexander V | Babenko, Andrey S | Petrochenko, Ksenia A | Sechko, O | Kornievskaya, EMaterial type: ArticleArticleContent type: Текст Media type: электронный Subject(s): компост | биогумус | микробный состав | вермикомпостGenre/Form: статьи в журналах Online resources: Click here to access online In: IOP Conference Series: Earth and Environmental Science Vol. 433. P. 012001 (1-8)Abstract: Eisenia fetida worms affecting the amount of bacteria from four trophic groups in poplar leaf litter vermicompost was investigated. As a control, composted and vermicomposted horse manure was used. The number of ammonifiers in the vermicomposted manure was higher than in the composted; the opposite situation was observed in poplar litter substrates – the number of ammonifiers was higher in compost than in vermicompost. Nitrogen fixers of the genus Azotobacter were detected only in vermicomposts and were absent in composts. The activity of nitrogen fixers of the genus Azotobacter was higher in vermicomposted poplar leaf litter than in vermicomposted manure. The total amount of ammonifiers and utilizers of inorganic nitrogen is considered to be an integral indicator of the quality of organic fertilizers. This indicator was independent of the presence or absence of worms and was higher in the substrates based on poplar leaf litter compared to the ones based on manure. As the amount of nitrate nitrogen (NO3-nitrogen) is larger in the leaf litter substrates than in the horse manure substrates, we recommend using composted and vermicomposted poplar leaf litter as organic fertilizer with a microbial structure, which provides enough nitrogen available to plants.
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Eisenia fetida worms affecting the amount of bacteria from four trophic groups in
poplar leaf litter vermicompost was investigated. As a control, composted and vermicomposted
horse manure was used. The number of ammonifiers in the vermicomposted manure was higher
than in the composted; the opposite situation was observed in poplar litter substrates – the
number of ammonifiers was higher in compost than in vermicompost. Nitrogen fixers of the
genus Azotobacter were detected only in vermicomposts and were absent in composts. The
activity of nitrogen fixers of the genus Azotobacter was higher in vermicomposted poplar leaf
litter than in vermicomposted manure. The total amount of ammonifiers and utilizers of inorganic
nitrogen is considered to be an integral indicator of the quality of organic fertilizers. This
indicator was independent of the presence or absence of worms and was higher in the substrates
based on poplar leaf litter compared to the ones based on manure. As the amount of nitrate
nitrogen (NO3-nitrogen) is larger in the leaf litter substrates than in the horse manure substrates,
we recommend using composted and vermicomposted poplar leaf litter as organic fertilizer with
a microbial structure, which provides enough nitrogen available to plants.

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