Nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with N sources and moisture regime. I. Nitrogen transformations
Laboratory studies were carried out to investigate the nitrogen (N) transformation processes of three Malaysian acid soils (pHH2O ranged from 3.74-4.44) belonging to Aeric Tropic Fluvaquent and Xanthic Hapludox. The soils, amended with inorganic and organic N sources, were incubated at 25°C separate...
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| Format: | Article |
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Taylor & Francis
2001
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| Online Access: | http://psasir.upm.edu.my/id/eprint/116131/ |
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| author | Khalil, M.I. Cleemput, O. Van Boeckx, P. Rosenani, A.B. |
| author_facet | Khalil, M.I. Cleemput, O. Van Boeckx, P. Rosenani, A.B. |
| author_sort | Khalil, M.I. |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Laboratory studies were carried out to investigate the nitrogen (N) transformation processes of three Malaysian acid soils (pHH2O ranged from 3.74-4.44) belonging to Aeric Tropic Fluvaquent and Xanthic Hapludox. The soils, amended with inorganic and organic N sources, were incubated at 25°C separately under aerobic and anaerobic conditions. The N mineralization followed zero order kinetics during 15 days of the incubation with a large accumulation of NH+ 4-N under both moisture levels. Addition of sugar beet leaves, having a lower C/N ratio, influenced N mineralization in terms of NH+4 accumulation to a greater extent. Wheat straw, having a wider C/N ratio, limited N mineralization i.e. might induce immobilization of N. Under aerobic conditions, nitrification was either small with NH+4 fertilizer or caused some NO-3 reduction with organic residues and the increased mineralized N with NH+4-fertilizer indicated a priming effect might occur. Under anaerobic conditions, disappearance of NO-3 followed first order kinetics. The disappearance was very rapid supplied with both NO-3-fertilizer and sugar beet leaves. The acidity did not limit intense NO-3 reduction rather showed a predominant accumulation of NH-4-N under anaerobic conditions. Accumulation of NO-2 was low because of the small nitrification or slow NO-3 reduction rate under aerobic conditions. The NO-3 fertilizer and sugar beet leaves increased NO-2 accumulation to several-folds under anaerobic conditions followed by its consumption. The N transformations varied with N sources and moisture regime. |
| first_indexed | 2025-11-15T14:28:29Z |
| format | Article |
| id | upm-116131 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T14:28:29Z |
| publishDate | 2001 |
| publisher | Taylor & Francis |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-1161312025-03-21T02:22:27Z http://psasir.upm.edu.my/id/eprint/116131/ Nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with N sources and moisture regime. I. Nitrogen transformations Khalil, M.I. Cleemput, O. Van Boeckx, P. Rosenani, A.B. Laboratory studies were carried out to investigate the nitrogen (N) transformation processes of three Malaysian acid soils (pHH2O ranged from 3.74-4.44) belonging to Aeric Tropic Fluvaquent and Xanthic Hapludox. The soils, amended with inorganic and organic N sources, were incubated at 25°C separately under aerobic and anaerobic conditions. The N mineralization followed zero order kinetics during 15 days of the incubation with a large accumulation of NH+ 4-N under both moisture levels. Addition of sugar beet leaves, having a lower C/N ratio, influenced N mineralization in terms of NH+4 accumulation to a greater extent. Wheat straw, having a wider C/N ratio, limited N mineralization i.e. might induce immobilization of N. Under aerobic conditions, nitrification was either small with NH+4 fertilizer or caused some NO-3 reduction with organic residues and the increased mineralized N with NH+4-fertilizer indicated a priming effect might occur. Under anaerobic conditions, disappearance of NO-3 followed first order kinetics. The disappearance was very rapid supplied with both NO-3-fertilizer and sugar beet leaves. The acidity did not limit intense NO-3 reduction rather showed a predominant accumulation of NH-4-N under anaerobic conditions. Accumulation of NO-2 was low because of the small nitrification or slow NO-3 reduction rate under aerobic conditions. The NO-3 fertilizer and sugar beet leaves increased NO-2 accumulation to several-folds under anaerobic conditions followed by its consumption. The N transformations varied with N sources and moisture regime. Taylor & Francis 2001 Article PeerReviewed Khalil, M.I. and Cleemput, O. Van and Boeckx, P. and Rosenani, A.B. (2001) Nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with N sources and moisture regime. I. Nitrogen transformations. Communications in Soil Science and Plant Analysis, 32 (17-18). pp. 2893-2907. ISSN 0010-3624 https://www.tandfonline.com/doi/full/10.1081/CSS-120000970 10.1081/CSS-120000970 |
| spellingShingle | Khalil, M.I. Cleemput, O. Van Boeckx, P. Rosenani, A.B. Nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with N sources and moisture regime. I. Nitrogen transformations |
| title | Nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with N sources and moisture regime. I. Nitrogen transformations |
| title_full | Nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with N sources and moisture regime. I. Nitrogen transformations |
| title_fullStr | Nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with N sources and moisture regime. I. Nitrogen transformations |
| title_full_unstemmed | Nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with N sources and moisture regime. I. Nitrogen transformations |
| title_short | Nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with N sources and moisture regime. I. Nitrogen transformations |
| title_sort | nitrogen transformations and emission of greenhouse gases from three acid soils of humid tropics amended with n sources and moisture regime. i. nitrogen transformations |
| url | http://psasir.upm.edu.my/id/eprint/116131/ http://psasir.upm.edu.my/id/eprint/116131/ http://psasir.upm.edu.my/id/eprint/116131/ |