Plant availability of two phosphate rock materials in acid Malaysian soils
The amount of phosphorus (P) dissolved in a closed-incubation system, in soils receiving Christmas Island grade-A phosphate rock (CIPR), Gafsa phosphate rock (GPR), and triple superphosphate (TSP), as measured by extraction with 0.5M NaHC03 (ΔPb) or 0.5M NaOH (AP) and expressed as ΔPb/ΔP*100 (PDP) w...
| Main Authors: | , |
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| Format: | Article |
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1994
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| Online Access: | http://psasir.upm.edu.my/id/eprint/115262/ |
| _version_ | 1848866729651863552 |
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| author | Hanafi, M.M. Syers, J.K. |
| author_facet | Hanafi, M.M. Syers, J.K. |
| author_sort | Hanafi, M.M. |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The amount of phosphorus (P) dissolved in a closed-incubation system, in soils receiving Christmas Island grade-A phosphate rock (CIPR), Gafsa phosphate rock (GPR), and triple superphosphate (TSP), as measured by extraction with 0.5M NaHC03 (ΔPb) or 0.5M NaOH (AP) and expressed as ΔPb/ΔP*100 (PDP) was compared to P uptake (ΔPs) by Setaria in a glasshouse experiment. There was no direct relationship between ΔPs and PDP for CIPR, GPR, and TSP added at 50 and 150 mgP/kg soil to three Malaysian soils (Bungor, Kundor, and Segamat) during a 10-month period. Averaged across soils, rate of addition, and P sources, ΔPs was 17% higher than PDP. Overestimation of PDP by ΔPs could be due to the ability of the roots of Setaria to use more of the P which is dissolved from the three P sources and then chemisorbed, than can be extracted by the NaHC03 reagent. The chemisorbed P pool is extractable using 0.5M NaOH. There was a close relationship between ΔPs and AP, with a correlation coefficient of 0.85*. Residual P, determined by Pb method after each harvest, successfully predicted Ps by Setaria in the subsequent harvest with correlation coefficients varying between 0.74* and 0.99** for CIPR, GPR, and TSP in five soils (Bungor, Durian, Kundor, Segamat, and Tok Yong). The critical Pb values ranged from 5 for Durian to 10 mgP/kg soil for Kundor. |
| first_indexed | 2025-11-15T14:25:14Z |
| format | Article |
| id | upm-115262 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T14:25:14Z |
| publishDate | 1994 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-1152622025-02-27T02:37:22Z http://psasir.upm.edu.my/id/eprint/115262/ Plant availability of two phosphate rock materials in acid Malaysian soils Hanafi, M.M. Syers, J.K. The amount of phosphorus (P) dissolved in a closed-incubation system, in soils receiving Christmas Island grade-A phosphate rock (CIPR), Gafsa phosphate rock (GPR), and triple superphosphate (TSP), as measured by extraction with 0.5M NaHC03 (ΔPb) or 0.5M NaOH (AP) and expressed as ΔPb/ΔP*100 (PDP) was compared to P uptake (ΔPs) by Setaria in a glasshouse experiment. There was no direct relationship between ΔPs and PDP for CIPR, GPR, and TSP added at 50 and 150 mgP/kg soil to three Malaysian soils (Bungor, Kundor, and Segamat) during a 10-month period. Averaged across soils, rate of addition, and P sources, ΔPs was 17% higher than PDP. Overestimation of PDP by ΔPs could be due to the ability of the roots of Setaria to use more of the P which is dissolved from the three P sources and then chemisorbed, than can be extracted by the NaHC03 reagent. The chemisorbed P pool is extractable using 0.5M NaOH. There was a close relationship between ΔPs and AP, with a correlation coefficient of 0.85*. Residual P, determined by Pb method after each harvest, successfully predicted Ps by Setaria in the subsequent harvest with correlation coefficients varying between 0.74* and 0.99** for CIPR, GPR, and TSP in five soils (Bungor, Durian, Kundor, Segamat, and Tok Yong). The critical Pb values ranged from 5 for Durian to 10 mgP/kg soil for Kundor. 1994 Article PeerReviewed Hanafi, M.M. and Syers, J.K. (1994) Plant availability of two phosphate rock materials in acid Malaysian soils. Communications in Soil Science and Plant Analysis, 25 (19-20). pp. 3171-3189. ISSN 0010-3624; eISSN: 1532-2416 https://www.tandfonline.com/doi/full/10.1080/00103629409369256 10.1080/00103629409369256 |
| spellingShingle | Hanafi, M.M. Syers, J.K. Plant availability of two phosphate rock materials in acid Malaysian soils |
| title | Plant availability of two phosphate rock materials in acid Malaysian soils |
| title_full | Plant availability of two phosphate rock materials in acid Malaysian soils |
| title_fullStr | Plant availability of two phosphate rock materials in acid Malaysian soils |
| title_full_unstemmed | Plant availability of two phosphate rock materials in acid Malaysian soils |
| title_short | Plant availability of two phosphate rock materials in acid Malaysian soils |
| title_sort | plant availability of two phosphate rock materials in acid malaysian soils |
| url | http://psasir.upm.edu.my/id/eprint/115262/ http://psasir.upm.edu.my/id/eprint/115262/ http://psasir.upm.edu.my/id/eprint/115262/ |