Evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from Peninsular Malaysia
The potassium (K) supplying capacity of a deeply weathered profile developed over granite from Peninsular Malaysia was investigated by employing the quantity-intensity (Q/I) approach. The values of potential buffering capacity (PBC(K)), labile K (K(L)), specific K (K0), and specific K sites (K(X)) w...
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| Format: | Article |
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Marcel Dekker Inc.
1999
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| Online Access: | http://psasir.upm.edu.my/id/eprint/115277/ |
| _version_ | 1848866733755990016 |
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| author | Hamdan, J. Burnham, C.P. Ruhana, B. |
| author_facet | Hamdan, J. Burnham, C.P. Ruhana, B. |
| author_sort | Hamdan, J. |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The potassium (K) supplying capacity of a deeply weathered profile developed over granite from Peninsular Malaysia was investigated by employing the quantity-intensity (Q/I) approach. The values of potential buffering capacity (PBC(K)), labile K (K(L)), specific K (K0), and specific K sites (K(X)) were considerably higher in the saprolite zones as compared to the solum layers. This indicated that depletion of K on cropping would be faster in the solum materials than in the saprolites. Potassium equilibrium activity ratio was in the sequence: solum > middle saprolite > upper saprolite. Free energy values showed low, but sufficient, level of available K reserve in this profile. The relationships of Q/I parameters with physico-chemical characteristics and clay mineralogy of the profile were discussed. The changes in the Q/I parameters as a function of depth were found to be associated with the contents of clay and organic matter in the solum, while in the saprolites, the clay mineralogy which composed mainly of K-feldspar, mica, and mica-smectite seemed to be the main factor. |
| first_indexed | 2025-11-15T14:25:18Z |
| format | Article |
| id | upm-115277 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T14:25:18Z |
| publishDate | 1999 |
| publisher | Marcel Dekker Inc. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-1152772025-02-27T07:16:13Z http://psasir.upm.edu.my/id/eprint/115277/ Evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from Peninsular Malaysia Hamdan, J. Burnham, C.P. Ruhana, B. The potassium (K) supplying capacity of a deeply weathered profile developed over granite from Peninsular Malaysia was investigated by employing the quantity-intensity (Q/I) approach. The values of potential buffering capacity (PBC(K)), labile K (K(L)), specific K (K0), and specific K sites (K(X)) were considerably higher in the saprolite zones as compared to the solum layers. This indicated that depletion of K on cropping would be faster in the solum materials than in the saprolites. Potassium equilibrium activity ratio was in the sequence: solum > middle saprolite > upper saprolite. Free energy values showed low, but sufficient, level of available K reserve in this profile. The relationships of Q/I parameters with physico-chemical characteristics and clay mineralogy of the profile were discussed. The changes in the Q/I parameters as a function of depth were found to be associated with the contents of clay and organic matter in the solum, while in the saprolites, the clay mineralogy which composed mainly of K-feldspar, mica, and mica-smectite seemed to be the main factor. Marcel Dekker Inc. 1999 Article PeerReviewed Hamdan, J. and Burnham, C.P. and Ruhana, B. (1999) Evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from Peninsular Malaysia. Communications in Soil Science and Plant Analysis, 30 (17-18). pp. 2311-2321. ISSN 0010-3624; eISSN: 0010-3624 https://www.tandfonline.com/doi/full/10.1080/00103629909370375 10.1080/00103629909370375 |
| spellingShingle | Hamdan, J. Burnham, C.P. Ruhana, B. Evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from Peninsular Malaysia |
| title | Evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from Peninsular Malaysia |
| title_full | Evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from Peninsular Malaysia |
| title_fullStr | Evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from Peninsular Malaysia |
| title_full_unstemmed | Evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from Peninsular Malaysia |
| title_short | Evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from Peninsular Malaysia |
| title_sort | evaluation of quantity-intensity relationships of potassium in deeply weathered soil profile developed over granite from peninsular malaysia |
| url | http://psasir.upm.edu.my/id/eprint/115277/ http://psasir.upm.edu.my/id/eprint/115277/ http://psasir.upm.edu.my/id/eprint/115277/ |