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Humic acid formation in artificial soils amended with compost at different stages of organic matter evolution.
J Environ Qual. 2008 Jul-Aug; 37(4):1608-16.JE

Abstract

A composting process was conducted under optimal conditions for 150 d, obtaining three biomasses at different levels of maturity: raw material (RM), fresh compost obtained after 11 d of composting (FC), and evolved compost (EC) obtained after 150 d of composting. During the composting process, HAs were extracted and fully characterized by mass balance, DRIFT, and 1H and 13C-nuclear magnetic resonance spectroscopy. Each compost sample was incubated for 180 d in an artificial soil, after which HA extraction was repeated and characterized. To compare composts containing different amounts of labile organic matter (OM), an equal amount of unhydrolyzable OM was added to the soils. Our results indicated that compost HAs consist of a biologically and chemically stable fraction (i.e., the unhydrolyzable HA [U-HA]) and a labile fraction, whose relative contents depended on the composting duration. Humic acid from more EC contained a higher amount of recalcitrant fraction (aromatic carbon) and a lesser amount of labile fraction (aliphatic carbon) than HA from RM and FC. These results suggest that the humification process during composting preserves the more recalcitrant fraction of the compost-alkali soluble/acid insoluble fraction (HA-fraction). Incubation of composts in soil showed that due to the higher labile fraction content, HAs from raw material were more degraded than those from EC. The abundance of labile carbon of soil amended with less-evolved compost (RM and FC) allowed the more recalcitrant fractions of U-HA to be more preserved than in EC. These results suggest that less-evolved compost could contribute more than well evolved compost to the stable soil OM.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Adani F
DiProVe-Università di Milano, via Celoria 2, 20133 Milano, Italy. fabrizio.adani@unimi.it
Spagnol M
No affiliation info available

MeSH

Carbon IsotopesHumic SubstancesMagnetic Resonance SpectroscopyOrganic ChemicalsProtonsSoil

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18574194

Citation

Adani, Fabrizio, and M Spagnol. "Humic Acid Formation in Artificial Soils Amended With Compost at Different Stages of Organic Matter Evolution." Journal of Environmental Quality, vol. 37, no. 4, 2008, pp. 1608-16.
Adani F, Spagnol M. Humic acid formation in artificial soils amended with compost at different stages of organic matter evolution. J Environ Qual. 2008;37(4):1608-16.
Adani, F., & Spagnol, M. (2008). Humic acid formation in artificial soils amended with compost at different stages of organic matter evolution. Journal of Environmental Quality, 37(4), 1608-16. https://doi.org/10.2134/jeq2007.0108
Adani F, Spagnol M. Humic Acid Formation in Artificial Soils Amended With Compost at Different Stages of Organic Matter Evolution. J Environ Qual. 2008 Jul-Aug;37(4):1608-16. PubMed PMID: 18574194.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Humic acid formation in artificial soils amended with compost at different stages of organic matter evolution. AU - Adani,Fabrizio, AU - Spagnol,M, Y1 - 2008/06/23/ PY - 2008/6/25/pubmed PY - 2008/8/21/medline PY - 2008/6/25/entrez SP - 1608 EP - 16 JF - Journal of environmental quality JO - J Environ Qual VL - 37 IS - 4 N2 - A composting process was conducted under optimal conditions for 150 d, obtaining three biomasses at different levels of maturity: raw material (RM), fresh compost obtained after 11 d of composting (FC), and evolved compost (EC) obtained after 150 d of composting. During the composting process, HAs were extracted and fully characterized by mass balance, DRIFT, and 1H and 13C-nuclear magnetic resonance spectroscopy. Each compost sample was incubated for 180 d in an artificial soil, after which HA extraction was repeated and characterized. To compare composts containing different amounts of labile organic matter (OM), an equal amount of unhydrolyzable OM was added to the soils. Our results indicated that compost HAs consist of a biologically and chemically stable fraction (i.e., the unhydrolyzable HA [U-HA]) and a labile fraction, whose relative contents depended on the composting duration. Humic acid from more EC contained a higher amount of recalcitrant fraction (aromatic carbon) and a lesser amount of labile fraction (aliphatic carbon) than HA from RM and FC. These results suggest that the humification process during composting preserves the more recalcitrant fraction of the compost-alkali soluble/acid insoluble fraction (HA-fraction). Incubation of composts in soil showed that due to the higher labile fraction content, HAs from raw material were more degraded than those from EC. The abundance of labile carbon of soil amended with less-evolved compost (RM and FC) allowed the more recalcitrant fractions of U-HA to be more preserved than in EC. These results suggest that less-evolved compost could contribute more than well evolved compost to the stable soil OM. SN - 0047-2425 UR - https://www.unboundmedicine.com/medline/citation/18574194/Humic_acid_formation_in_artificial_soils_amended_with_compost_at_different_stages_of_organic_matter_evolution_ L2 - https://doi.org/10.2134/jeq2007.0108 DB - PRIME DP - Unbound Medicine ER -