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Investigation of microbiological processes during long-term storage of grey forest soil samples

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dc.contributor.authorMalynovska, I.
dc.contributor.authorBulgakov, V.
dc.contributor.authorRucins, A.
dc.date.accessioned2024-06-07T13:04:01Z
dc.date.available2024-06-07T13:04:01Z
dc.date.issued2024
dc.descriptionReceived: January 24th, 2024 ; Accepted: April 25th, 2024 ; Published: May 21st, 2024 ; Correspondence: adolfs.rucins@lbtu.lveng
dc.description.abstractInvestigation of a decrease in the viability of microorganism cells in the soil samples, stored for a long time in an air-dry state, has both theoretical and practical significance since in agrochemistry and the soil science it is a custom to store the soil samples for many years and decades, taking it as an axiom that the properties of these samples remain unchanged. To find out what are the patterns of survival of microorganisms of various ecological-trophic, functional and systematic groups, their viability was studied in samples of gray forest soil, stored for 32 months in an air-dry state. It has been shown that the number of microorganisms of most groups decreases by 42–94 times, the number of polysaccharides-synthesizing microorganisms decreases maximum- by 3,993–18,210 times, depending on the agricultural practices, used in a stationary experiment. the number of spores and cysts decreases. The microorganisms which have the least decrease in the number of colony-forming units of micromycetes and Azotobacter as groups that have forms of surviving unfavourable conditions during storage are spores and cysts. In addition, the physiological and biochemical activity of micromycetes decreases significantly, compared to their activity in the original (initial) fresh soil. During storage the number and share in the total number of melanin-synthesizing micromycetes sharply decreases from 65.8–94.6% to 2.48–5.17%. When storing soil in an air-dry state, the rate of decline in the number of microorganisms depends on the functional affiliation of the group and on agrotechnical techniques that were previously used in the stationary experiments: liming, application of mineral fertilizers, ploughing in the by-products of the predecessor crop in the crop rotation, and the biomass of the sideral crop. The organic matter, ploughed into the soil, promotes the survival of ammonifiers, mineral nitrogen immobilizers, Azotobacter and polysaccharide-synthesizing microorganisms. Ploughing in of crop by-products reduce the number and proportion of melanin-synthesizing micromycetes. Verification of the obtained data, using long-term stored soil samples, is not permissible since microbiological processes occur in the soil during which the soil microbiota consumes the macro- and microelements, present in it, organic and organomineral complexes, including humus.eng
dc.identifier.issn2228-4907
dc.identifier.publicationAgronomy Research, 2024, vol. 22, Special Issue 1, pp. 484–494eng
dc.identifier.urihttp://hdl.handle.net/10492/9351
dc.identifier.urihttps://doi.org/10.15159/ar.24.045
dc.publisherEstonian University of Life Scienceseng
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)eng
dc.rightsinfo:eu-repo/semantics/openAccesseng
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectstorageeng
dc.subjectsoileng
dc.subjectammonifierseng
dc.subjectAzotobacterlat
dc.subjectmicromyceteseng
dc.subjectnumbereng
dc.subjectphysiological and biochemical activityeng
dc.subjectarticleseng
dc.titleInvestigation of microbiological processes during long-term storage of grey forest soil sampleseng
dc.typeinfo:eu-repo/semantics/articleeng

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2024, Vol. 22, Special Issue 1