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Impact of Chitosan on the Mechanical Stability of Soils

Chitosan is becoming increasingly applied in agriculture, mostly as a powder, however little is known about its effect on soil mechanical properties. Uniaxial compression test was performed for cylindrical soil aggregates prepared from four soils of various properties (very acidic Podzol, acidic Are...

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Autores principales: Adamczuk, Agnieszka, Jozefaciuk, Grzegorz
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9000621/
https://www.ncbi.nlm.nih.gov/pubmed/35408671
http://dx.doi.org/10.3390/molecules27072273
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author Adamczuk, Agnieszka
Jozefaciuk, Grzegorz
author_facet Adamczuk, Agnieszka
Jozefaciuk, Grzegorz
author_sort Adamczuk, Agnieszka
collection PubMed
description Chitosan is becoming increasingly applied in agriculture, mostly as a powder, however little is known about its effect on soil mechanical properties. Uniaxial compression test was performed for cylindrical soil aggregates prepared from four soils of various properties (very acidic Podzol, acidic Arenosol, neutral Fluvisol and alkaline Umbrisol) containing different proportions of two kinds of chitosan (CS1 of higher molecular mass and lower deacetylation degree, and CS2 of lower molecular mass and higher deacetylation degree), pretreated with 1 and 10 wetting–drying cycles. In most cases increasing chitosan rates successively decreased the mechanical stability of soils that was accompanied by a tendential increase in soil porosity. In one case (Fluvisol treated with CS2) the porosity decreased and mechanical stability increased with increasing chitosan dose. The behavior of acidic soils (Podzol and Arenosol) treated with CS2, differed from the other soils: after an initial decrease, the strength of aggregates increased with increasing chitosan amendment, despite the porosity consequently decreasing. After 10 wetting–drying cycles, the strength of the aggregates of acidic soils appeared to increase while it decreased for neutral and alkaline soils. Possible mechanisms of soil–chitosan interactions affecting mechanical strength are discussed and linked with soil water stability and wettability.
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spelling pubmed-90006212022-04-12 Impact of Chitosan on the Mechanical Stability of Soils Adamczuk, Agnieszka Jozefaciuk, Grzegorz Molecules Article Chitosan is becoming increasingly applied in agriculture, mostly as a powder, however little is known about its effect on soil mechanical properties. Uniaxial compression test was performed for cylindrical soil aggregates prepared from four soils of various properties (very acidic Podzol, acidic Arenosol, neutral Fluvisol and alkaline Umbrisol) containing different proportions of two kinds of chitosan (CS1 of higher molecular mass and lower deacetylation degree, and CS2 of lower molecular mass and higher deacetylation degree), pretreated with 1 and 10 wetting–drying cycles. In most cases increasing chitosan rates successively decreased the mechanical stability of soils that was accompanied by a tendential increase in soil porosity. In one case (Fluvisol treated with CS2) the porosity decreased and mechanical stability increased with increasing chitosan dose. The behavior of acidic soils (Podzol and Arenosol) treated with CS2, differed from the other soils: after an initial decrease, the strength of aggregates increased with increasing chitosan amendment, despite the porosity consequently decreasing. After 10 wetting–drying cycles, the strength of the aggregates of acidic soils appeared to increase while it decreased for neutral and alkaline soils. Possible mechanisms of soil–chitosan interactions affecting mechanical strength are discussed and linked with soil water stability and wettability. MDPI 2022-03-31 /pmc/articles/PMC9000621/ /pubmed/35408671 http://dx.doi.org/10.3390/molecules27072273 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Adamczuk, Agnieszka
Jozefaciuk, Grzegorz
Impact of Chitosan on the Mechanical Stability of Soils
title Impact of Chitosan on the Mechanical Stability of Soils
title_full Impact of Chitosan on the Mechanical Stability of Soils
title_fullStr Impact of Chitosan on the Mechanical Stability of Soils
title_full_unstemmed Impact of Chitosan on the Mechanical Stability of Soils
title_short Impact of Chitosan on the Mechanical Stability of Soils
title_sort impact of chitosan on the mechanical stability of soils
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9000621/
https://www.ncbi.nlm.nih.gov/pubmed/35408671
http://dx.doi.org/10.3390/molecules27072273
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