New Insight into Organomineral Interactions in Soils. The Impact of Clay-Size Peat-Derived Organic Species on the Structure and the Strength of Soil Silt Aggregates
Knowledge of the effects of different organic species on soil structure and strength is gained mostly from experiments on natural soils amended with organic substances of various particle sizes, pH, ionic composition, and inorganic impurities. It greatly diversifies the experimental results and shad...
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| Format: | Article |
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MDPI AG
2023-12-01
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| Series: | Agriculture |
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| Online Access: | https://www.mdpi.com/2077-0472/13/12/2241 |
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| author | Kamil Skic Agnieszka Adamczuk Patrycja Boguta Angelika Gryta Salman Masoudi Soltani Svetlana Ignatova Grzegorz Józefaciuk |
| author_facet | Kamil Skic Agnieszka Adamczuk Patrycja Boguta Angelika Gryta Salman Masoudi Soltani Svetlana Ignatova Grzegorz Józefaciuk |
| author_sort | Kamil Skic |
| collection | DOAJ |
| description | Knowledge of the effects of different organic species on soil structure and strength is gained mostly from experiments on natural soils amended with organic substances of various particle sizes, pH, ionic composition, and inorganic impurities. It greatly diversifies the experimental results and shadows individual effects of organic amendments. Therefore, to look for a clearer view, we examined the impact of HCl-washed clay-size organic species: peat, humic acids, residue after humic acid extraction, and two biochars, all derived from the same peat and having similar particles, on the structure and strength of artificial soil silt aggregates using mercury intrusion porosimetry, bulk density measurements, SEM, and uniaxial compression. Bulk density increased due to humic acid addition and decreased for the other amendments. The total pore volumes behaved oppositely. All organic substances except humic acid decreased the pore surface fractal dimension, indicating a smoothening of the pore surface. Humic acid appeared to occupy mostly the spaces between the silt grains skeleton, while the other species were also located upon silt grains. The latter effect was most evident for 600 °C heated biochar. Humic acid, peat, and the residue after humic acid extraction improved mechanical stability, whereas both biochars weakened the aggregates, which means that bulk density plays a smaller role in the mechanical stability of granular materials, as it is usually considered. A new equation relating maximum stress and the amount of the organic additives was proposed. |
| first_indexed | 2024-03-08T21:05:21Z |
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| id | doaj.art-434e57e78d684613bfc94166ddb0d582 |
| institution | Directory Open Access Journal |
| issn | 2077-0472 |
| language | English |
| last_indexed | 2024-03-08T21:05:21Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Agriculture |
| spelling | doaj.art-434e57e78d684613bfc94166ddb0d5822023-12-22T13:45:34ZengMDPI AGAgriculture2077-04722023-12-011312224110.3390/agriculture13122241New Insight into Organomineral Interactions in Soils. The Impact of Clay-Size Peat-Derived Organic Species on the Structure and the Strength of Soil Silt AggregatesKamil Skic0Agnieszka Adamczuk1Patrycja Boguta2Angelika Gryta3Salman Masoudi Soltani4Svetlana Ignatova5Grzegorz Józefaciuk6Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4 Str., 20-290 Lublin, PolandInstitute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4 Str., 20-290 Lublin, PolandInstitute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4 Str., 20-290 Lublin, PolandInstitute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4 Str., 20-290 Lublin, PolandDepartment of Chemical Engineering, Brunel University London, London UB8 3PH, UKDepartment of Chemical Engineering, Brunel University London, London UB8 3PH, UKInstitute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4 Str., 20-290 Lublin, PolandKnowledge of the effects of different organic species on soil structure and strength is gained mostly from experiments on natural soils amended with organic substances of various particle sizes, pH, ionic composition, and inorganic impurities. It greatly diversifies the experimental results and shadows individual effects of organic amendments. Therefore, to look for a clearer view, we examined the impact of HCl-washed clay-size organic species: peat, humic acids, residue after humic acid extraction, and two biochars, all derived from the same peat and having similar particles, on the structure and strength of artificial soil silt aggregates using mercury intrusion porosimetry, bulk density measurements, SEM, and uniaxial compression. Bulk density increased due to humic acid addition and decreased for the other amendments. The total pore volumes behaved oppositely. All organic substances except humic acid decreased the pore surface fractal dimension, indicating a smoothening of the pore surface. Humic acid appeared to occupy mostly the spaces between the silt grains skeleton, while the other species were also located upon silt grains. The latter effect was most evident for 600 °C heated biochar. Humic acid, peat, and the residue after humic acid extraction improved mechanical stability, whereas both biochars weakened the aggregates, which means that bulk density plays a smaller role in the mechanical stability of granular materials, as it is usually considered. A new equation relating maximum stress and the amount of the organic additives was proposed.https://www.mdpi.com/2077-0472/13/12/2241organic carbonsilt aggregatesaggregate structureaggregate strengthmercury porosimetrybulk density |
| spellingShingle | Kamil Skic Agnieszka Adamczuk Patrycja Boguta Angelika Gryta Salman Masoudi Soltani Svetlana Ignatova Grzegorz Józefaciuk New Insight into Organomineral Interactions in Soils. The Impact of Clay-Size Peat-Derived Organic Species on the Structure and the Strength of Soil Silt Aggregates Agriculture organic carbon silt aggregates aggregate structure aggregate strength mercury porosimetry bulk density |
| title | New Insight into Organomineral Interactions in Soils. The Impact of Clay-Size Peat-Derived Organic Species on the Structure and the Strength of Soil Silt Aggregates |
| title_full | New Insight into Organomineral Interactions in Soils. The Impact of Clay-Size Peat-Derived Organic Species on the Structure and the Strength of Soil Silt Aggregates |
| title_fullStr | New Insight into Organomineral Interactions in Soils. The Impact of Clay-Size Peat-Derived Organic Species on the Structure and the Strength of Soil Silt Aggregates |
| title_full_unstemmed | New Insight into Organomineral Interactions in Soils. The Impact of Clay-Size Peat-Derived Organic Species on the Structure and the Strength of Soil Silt Aggregates |
| title_short | New Insight into Organomineral Interactions in Soils. The Impact of Clay-Size Peat-Derived Organic Species on the Structure and the Strength of Soil Silt Aggregates |
| title_sort | new insight into organomineral interactions in soils the impact of clay size peat derived organic species on the structure and the strength of soil silt aggregates |
| topic | organic carbon silt aggregates aggregate structure aggregate strength mercury porosimetry bulk density |
| url | https://www.mdpi.com/2077-0472/13/12/2241 |
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