Analysis of Molecular Structure Changes in Humic Acids from Manure-Amended Soils over 17 Years Using Elemental Analysis and Solid-State <sup>13</sup>C Nuclear Magnetic Resonance Spectroscopy
Soil organic matter (SOM) plays an important role in regulating plant nutrient availability. Here, the effects of the long-term application of different forms of processed swine manure on the SOM structure are explored through the analysis of humic acid (HA) using elemental analysis and <sup>1...
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MDPI AG
2023-08-01
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| Series: | Soil Systems |
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| Online Access: | https://www.mdpi.com/2571-8789/7/3/76 |
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| author | Ibrahim Mohammed Busayo Kodaolu Tiequan Zhang Yutao Wang Yuki Audette James Longstaffe |
| author_facet | Ibrahim Mohammed Busayo Kodaolu Tiequan Zhang Yutao Wang Yuki Audette James Longstaffe |
| author_sort | Ibrahim Mohammed |
| collection | DOAJ |
| description | Soil organic matter (SOM) plays an important role in regulating plant nutrient availability. Here, the effects of the long-term application of different forms of processed swine manure on the SOM structure are explored through the analysis of humic acid (HA) using elemental analysis and <sup>13</sup>C solid-state nuclear magnetic resonance (NMR) spectroscopy. The HAs from soils amended with liquid swine manure (LSM) and swine manure compost (SMC) are found to be more humified compared to the soils treated with solid swine manure (SSM) and the control (CK). The H/C and O/C molar ratios suggest that carboxyl-rich aliphatic structures are the most important class of biomolecules contributing to the LSM- and SMC-HA structures, while lignin-like structures are the most important biomolecules contributing to the CK- and SSM-HAs. SSM promoted the formation of aliphatic polar structures, which are more susceptible to aerobic biodegradation, whereas the CK facilitated the inclusion of condensed aromatic structures into the HA. Apart from the LSM-HA, the proportion of carboxylic acid functional groups reduced with manure application, while the proportion of phenolic acid functional groups increased. LSM-HA has the highest potential to enhance plant nutrient availability. |
| first_indexed | 2024-03-10T21:59:51Z |
| format | Article |
| id | doaj.art-e870077e3d2847a68d027ca2a3bfb34c |
| institution | Directory Open Access Journal |
| issn | 2571-8789 |
| language | English |
| last_indexed | 2024-03-10T21:59:51Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Soil Systems |
| spelling | doaj.art-e870077e3d2847a68d027ca2a3bfb34c2023-11-19T12:59:53ZengMDPI AGSoil Systems2571-87892023-08-01737610.3390/soilsystems7030076Analysis of Molecular Structure Changes in Humic Acids from Manure-Amended Soils over 17 Years Using Elemental Analysis and Solid-State <sup>13</sup>C Nuclear Magnetic Resonance SpectroscopyIbrahim Mohammed0Busayo Kodaolu1Tiequan Zhang2Yutao Wang3Yuki Audette4James Longstaffe5School of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, CanadaSchool of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, CanadaHarrow Research and Development Centre, Agriculture and Agrifood Canada, Harrow, ON N0R 1G0, CanadaHarrow Research and Development Centre, Agriculture and Agrifood Canada, Harrow, ON N0R 1G0, CanadaSchool of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, CanadaSchool of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, CanadaSoil organic matter (SOM) plays an important role in regulating plant nutrient availability. Here, the effects of the long-term application of different forms of processed swine manure on the SOM structure are explored through the analysis of humic acid (HA) using elemental analysis and <sup>13</sup>C solid-state nuclear magnetic resonance (NMR) spectroscopy. The HAs from soils amended with liquid swine manure (LSM) and swine manure compost (SMC) are found to be more humified compared to the soils treated with solid swine manure (SSM) and the control (CK). The H/C and O/C molar ratios suggest that carboxyl-rich aliphatic structures are the most important class of biomolecules contributing to the LSM- and SMC-HA structures, while lignin-like structures are the most important biomolecules contributing to the CK- and SSM-HAs. SSM promoted the formation of aliphatic polar structures, which are more susceptible to aerobic biodegradation, whereas the CK facilitated the inclusion of condensed aromatic structures into the HA. Apart from the LSM-HA, the proportion of carboxylic acid functional groups reduced with manure application, while the proportion of phenolic acid functional groups increased. LSM-HA has the highest potential to enhance plant nutrient availability.https://www.mdpi.com/2571-8789/7/3/76soil organic mattersoil fertilityorganic soil amendmentssustainable agriculturehumic acid |
| spellingShingle | Ibrahim Mohammed Busayo Kodaolu Tiequan Zhang Yutao Wang Yuki Audette James Longstaffe Analysis of Molecular Structure Changes in Humic Acids from Manure-Amended Soils over 17 Years Using Elemental Analysis and Solid-State <sup>13</sup>C Nuclear Magnetic Resonance Spectroscopy Soil Systems soil organic matter soil fertility organic soil amendments sustainable agriculture humic acid |
| title | Analysis of Molecular Structure Changes in Humic Acids from Manure-Amended Soils over 17 Years Using Elemental Analysis and Solid-State <sup>13</sup>C Nuclear Magnetic Resonance Spectroscopy |
| title_full | Analysis of Molecular Structure Changes in Humic Acids from Manure-Amended Soils over 17 Years Using Elemental Analysis and Solid-State <sup>13</sup>C Nuclear Magnetic Resonance Spectroscopy |
| title_fullStr | Analysis of Molecular Structure Changes in Humic Acids from Manure-Amended Soils over 17 Years Using Elemental Analysis and Solid-State <sup>13</sup>C Nuclear Magnetic Resonance Spectroscopy |
| title_full_unstemmed | Analysis of Molecular Structure Changes in Humic Acids from Manure-Amended Soils over 17 Years Using Elemental Analysis and Solid-State <sup>13</sup>C Nuclear Magnetic Resonance Spectroscopy |
| title_short | Analysis of Molecular Structure Changes in Humic Acids from Manure-Amended Soils over 17 Years Using Elemental Analysis and Solid-State <sup>13</sup>C Nuclear Magnetic Resonance Spectroscopy |
| title_sort | analysis of molecular structure changes in humic acids from manure amended soils over 17 years using elemental analysis and solid state sup 13 sup c nuclear magnetic resonance spectroscopy |
| topic | soil organic matter soil fertility organic soil amendments sustainable agriculture humic acid |
| url | https://www.mdpi.com/2571-8789/7/3/76 |
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