The effect of C:P ratio of plant residues added to soils of contrasting phosphate sorption capacities on P uptake by Panicum maximum (Jacq.)
Reutilization of P from Setaria sphacelata residues having C:P ratios of 704:1, 227:1, and 77:1 was studied using a reverse 32P-isotopic dilution technique in the greenhouse. Residues were incorporated into two highly weathered Malaysian soils (Ultisols and Oxisols) treated with five levels of inorg...
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| Format: | Article |
| Language: | English |
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Springer
1994
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| Online Access: | http://psasir.upm.edu.my/id/eprint/112927/ http://psasir.upm.edu.my/id/eprint/112927/1/10-1108_00346650210413951.pdf |
| _version_ | 1848866078966415360 |
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| author | Umrit, Gunshiam Friesen, Dennis K. |
| author_facet | Umrit, Gunshiam Friesen, Dennis K. |
| author_sort | Umrit, Gunshiam |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Reutilization of P from Setaria sphacelata residues having C:P ratios of 704:1, 227:1, and 77:1 was studied using a reverse 32P-isotopic dilution technique in the greenhouse. Residues were incorporated into two highly weathered Malaysian soils (Ultisols and Oxisols) treated with five levels of inorganic P labeled with 32P and cropped with Panicum maximum (Jacq.). Yield of dry matter, total P, and 32P activity of Panicum was monitored through four cuttings spanning a period of approximately 13 weeks. Panicum yields and residue-P uptake were depressed by high and medium C:P ratio residues at the first cutting but recovered in subsequent cuttings. General adequacy of P concentrations in the affected tissue and its failure to respond to applied inorganic P among other factors suggest that the initial yield depression was not induced by P immobilization. The fractional percentage of P derived from residues increased with increasing P content of residues at all cuttings. Similarly, L-values were consistently greater on residue-treated soils. Residue P had greater effects on the soil with lower than on that with higher P-sorbing capacity. Changes in residue P uptake, L-values, and extractable P in soil between successive cuttings suggest a rapid release of a large amount of easily mineralizable residue P within the first 4 weeks, with the subsequent P release being much slower by comparison. |
| first_indexed | 2025-11-15T14:14:53Z |
| format | Article |
| id | upm-112927 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T14:14:53Z |
| publishDate | 1994 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-1129272025-01-27T06:56:40Z http://psasir.upm.edu.my/id/eprint/112927/ The effect of C:P ratio of plant residues added to soils of contrasting phosphate sorption capacities on P uptake by Panicum maximum (Jacq.) Umrit, Gunshiam Friesen, Dennis K. Reutilization of P from Setaria sphacelata residues having C:P ratios of 704:1, 227:1, and 77:1 was studied using a reverse 32P-isotopic dilution technique in the greenhouse. Residues were incorporated into two highly weathered Malaysian soils (Ultisols and Oxisols) treated with five levels of inorganic P labeled with 32P and cropped with Panicum maximum (Jacq.). Yield of dry matter, total P, and 32P activity of Panicum was monitored through four cuttings spanning a period of approximately 13 weeks. Panicum yields and residue-P uptake were depressed by high and medium C:P ratio residues at the first cutting but recovered in subsequent cuttings. General adequacy of P concentrations in the affected tissue and its failure to respond to applied inorganic P among other factors suggest that the initial yield depression was not induced by P immobilization. The fractional percentage of P derived from residues increased with increasing P content of residues at all cuttings. Similarly, L-values were consistently greater on residue-treated soils. Residue P had greater effects on the soil with lower than on that with higher P-sorbing capacity. Changes in residue P uptake, L-values, and extractable P in soil between successive cuttings suggest a rapid release of a large amount of easily mineralizable residue P within the first 4 weeks, with the subsequent P release being much slower by comparison. Springer 1994 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/112927/1/10-1108_00346650210413951.pdf Umrit, Gunshiam and Friesen, Dennis K. (1994) The effect of C:P ratio of plant residues added to soils of contrasting phosphate sorption capacities on P uptake by Panicum maximum (Jacq.). Plant and Soil, 158 (2). pp. 275-285. ISSN 0032-079X; eISSN: 1573-5036 https://link.springer.com/article/10.1007/BF00009501?error=cookies_not_supported&code=7af0ced7-8627-4f29-9053-aca2c2cb0d56 10.1007/bf00009501 |
| spellingShingle | Umrit, Gunshiam Friesen, Dennis K. The effect of C:P ratio of plant residues added to soils of contrasting phosphate sorption capacities on P uptake by Panicum maximum (Jacq.) |
| title | The effect of C:P ratio of plant residues added to soils of contrasting phosphate sorption capacities on P uptake by Panicum maximum (Jacq.) |
| title_full | The effect of C:P ratio of plant residues added to soils of contrasting phosphate sorption capacities on P uptake by Panicum maximum (Jacq.) |
| title_fullStr | The effect of C:P ratio of plant residues added to soils of contrasting phosphate sorption capacities on P uptake by Panicum maximum (Jacq.) |
| title_full_unstemmed | The effect of C:P ratio of plant residues added to soils of contrasting phosphate sorption capacities on P uptake by Panicum maximum (Jacq.) |
| title_short | The effect of C:P ratio of plant residues added to soils of contrasting phosphate sorption capacities on P uptake by Panicum maximum (Jacq.) |
| title_sort | effect of c:p ratio of plant residues added to soils of contrasting phosphate sorption capacities on p uptake by panicum maximum (jacq.) |
| url | http://psasir.upm.edu.my/id/eprint/112927/ http://psasir.upm.edu.my/id/eprint/112927/ http://psasir.upm.edu.my/id/eprint/112927/ http://psasir.upm.edu.my/id/eprint/112927/1/10-1108_00346650210413951.pdf |