Mineralizable N in some Malaysian rice soils
Mineralizable soil N is a very important N source in rice soils. In some cases more than 60% of the N requirement in an N fertilized rice crop is derived from soil N. A laboratory study was conducted to determine mineralizable (N) and mineralization constant (K) of 14 rice soils with varying soil pr...
| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
1988
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| Online Access: | http://psasir.upm.edu.my/id/eprint/19831/ http://psasir.upm.edu.my/id/eprint/19831/1/ID%2019831.pdf |
| _version_ | 1848843831432183808 |
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| author | Yusop, Mohd Khanif Rahimahbivi, O. H. |
| author_facet | Yusop, Mohd Khanif Rahimahbivi, O. H. |
| author_sort | Yusop, Mohd Khanif |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Mineralizable soil N is a very important N source in rice soils. In some cases more than 60% of the N requirement in an N fertilized rice crop is derived from soil N. A laboratory study was conducted to determine mineralizable (N) and mineralization constant (K) of 14 rice soils with varying soil properties under submerged condition. Soils were collected at the depth of 0-15cm and incubated for eight weeks. Ammonium N was extracted at 0,2,4,6 and 8 weeks and determined by steam distillation. The ammonium-N mineralized was used to calculate No and K. The No ranged between 20.0 to 154.1mg/kg which represented between 1.0% and 7.3% of the total N. The K values ranged between 0.11 to 0.72Wk-1. The mineralized N at a specified time can be determined by using No and K values. The calculated and the observed mineralized N were compared: the results showed good agreement between the two values. The No and K values were not significantly affected by the total N,organic C and C/N ratio,however there is a significant correlation between No and K (r=0.76). |
| first_indexed | 2025-11-15T08:21:17Z |
| format | Conference or Workshop Item |
| id | upm-19831 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T08:21:17Z |
| publishDate | 1988 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-198312017-05-08T10:07:30Z http://psasir.upm.edu.my/id/eprint/19831/ Mineralizable N in some Malaysian rice soils Yusop, Mohd Khanif Rahimahbivi, O. H. Mineralizable soil N is a very important N source in rice soils. In some cases more than 60% of the N requirement in an N fertilized rice crop is derived from soil N. A laboratory study was conducted to determine mineralizable (N) and mineralization constant (K) of 14 rice soils with varying soil properties under submerged condition. Soils were collected at the depth of 0-15cm and incubated for eight weeks. Ammonium N was extracted at 0,2,4,6 and 8 weeks and determined by steam distillation. The ammonium-N mineralized was used to calculate No and K. The No ranged between 20.0 to 154.1mg/kg which represented between 1.0% and 7.3% of the total N. The K values ranged between 0.11 to 0.72Wk-1. The mineralized N at a specified time can be determined by using No and K values. The calculated and the observed mineralized N were compared: the results showed good agreement between the two values. The No and K values were not significantly affected by the total N,organic C and C/N ratio,however there is a significant correlation between No and K (r=0.76). 1988 Conference or Workshop Item NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/19831/1/ID%2019831.pdf Yusop, Mohd Khanif and Rahimahbivi, O. H. (1988) Mineralizable N in some Malaysian rice soils. In: 1st. International Symposium on Paddy Soil Fertility, 6-13 Dec. 1988, Chiangmai, Thailand. . |
| spellingShingle | Yusop, Mohd Khanif Rahimahbivi, O. H. Mineralizable N in some Malaysian rice soils |
| title | Mineralizable N in some Malaysian rice soils |
| title_full | Mineralizable N in some Malaysian rice soils |
| title_fullStr | Mineralizable N in some Malaysian rice soils |
| title_full_unstemmed | Mineralizable N in some Malaysian rice soils |
| title_short | Mineralizable N in some Malaysian rice soils |
| title_sort | mineralizable n in some malaysian rice soils |
| url | http://psasir.upm.edu.my/id/eprint/19831/ http://psasir.upm.edu.my/id/eprint/19831/1/ID%2019831.pdf |