Upland rice response to phosphorus fertilization in Asia
Upland rice (Oryza sativa L.) yields on infertile, acid soils in the Asian uplands average only 1 Mg ha−1 Phosphorus deficiency is considered a major soil constraint to increased yield, but little quantitative information is available. We analyzed P responses of traditional rice on farm in Laos, Tha...
| Autores principales: | , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Wiley
2001
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/167019 |
| _version_ | 1855542835144556544 |
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| author | George, Thomas Magbanua, Roger Roder, Walter Van Keer, Koen Trébuil, Guy Reoma, Veronica |
| author_browse | George, Thomas Magbanua, Roger Reoma, Veronica Roder, Walter Trébuil, Guy Van Keer, Koen |
| author_facet | George, Thomas Magbanua, Roger Roder, Walter Van Keer, Koen Trébuil, Guy Reoma, Veronica |
| author_sort | George, Thomas |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Upland rice (Oryza sativa L.) yields on infertile, acid soils in the Asian uplands average only 1 Mg ha−1 Phosphorus deficiency is considered a major soil constraint to increased yield, but little quantitative information is available. We analyzed P responses of traditional rice on farm in Laos, Thailand, and the Philippines and improved varieties in researcher‐managed trials in the Philippines. Treatments in on‐farm trials were a control and 50 kg P ha−1 ± 100 and 50 kg ha−1 N and K, respectively. Treatments in researcher‐managed trials were P rates on an unlimed and limed Ultisol. Mehlich‐1 extractable P correlated with on‐farm grain yield (r = 0.47). Phosphorus fertilization increased average grain yield (1 Mg ha−1) by 20%, total biomass (4 Mg ha−1) by 27%, and P uptake (4.1 kg ha−1) by 53%. Yield increased 37% with P + N + K, but only 16% of the 2.4 Mg ha−1 biomass increase was grain. Improved rice in researcher‐managed trials responded to P, with a larger proportion of biomass partitioned to grain [i.e., higher harvest index (HI)]. Grain yield of ‘UPLRi‐5’ increased from 3.2 to 4.6 Mg ha−1 in limed soil while that of ‘IR55423–01’ increased from 3.4 to 4.0 Mg ha−1 in unlimed soil. Phosphorus fertilization always increased the frequency of higher yields averaged across trials, soils, varieties, and growing conditions. Yield gain from on‐farm P fertilization of traditional rice was small because of low HI, unlike in improved varieties, which had a HI. We infer that increasing upland rice yield in Asia would require genotypes with higher HI in addition to P fertilization. |
| format | Journal Article |
| id | CGSpace167019 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2001 |
| publishDateRange | 2001 |
| publishDateSort | 2001 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1670192025-12-08T09:54:28Z Upland rice response to phosphorus fertilization in Asia George, Thomas Magbanua, Roger Roder, Walter Van Keer, Koen Trébuil, Guy Reoma, Veronica phosphorus fertilizers soil fertility yields upland rice Upland rice (Oryza sativa L.) yields on infertile, acid soils in the Asian uplands average only 1 Mg ha−1 Phosphorus deficiency is considered a major soil constraint to increased yield, but little quantitative information is available. We analyzed P responses of traditional rice on farm in Laos, Thailand, and the Philippines and improved varieties in researcher‐managed trials in the Philippines. Treatments in on‐farm trials were a control and 50 kg P ha−1 ± 100 and 50 kg ha−1 N and K, respectively. Treatments in researcher‐managed trials were P rates on an unlimed and limed Ultisol. Mehlich‐1 extractable P correlated with on‐farm grain yield (r = 0.47). Phosphorus fertilization increased average grain yield (1 Mg ha−1) by 20%, total biomass (4 Mg ha−1) by 27%, and P uptake (4.1 kg ha−1) by 53%. Yield increased 37% with P + N + K, but only 16% of the 2.4 Mg ha−1 biomass increase was grain. Improved rice in researcher‐managed trials responded to P, with a larger proportion of biomass partitioned to grain [i.e., higher harvest index (HI)]. Grain yield of ‘UPLRi‐5’ increased from 3.2 to 4.6 Mg ha−1 in limed soil while that of ‘IR55423–01’ increased from 3.4 to 4.0 Mg ha−1 in unlimed soil. Phosphorus fertilization always increased the frequency of higher yields averaged across trials, soils, varieties, and growing conditions. Yield gain from on‐farm P fertilization of traditional rice was small because of low HI, unlike in improved varieties, which had a HI. We infer that increasing upland rice yield in Asia would require genotypes with higher HI in addition to P fertilization. 2001-11 2024-12-19T12:56:55Z 2024-12-19T12:56:55Z Journal Article https://hdl.handle.net/10568/167019 en Wiley George, Thomas; Magbanua, Roger; Roder, Walter; Van Keer, Koen; Trébuil, Guy and Reoma, Veronica. 2001. Upland rice response to phosphorus fertilization in Asia. Agronomy Journal, Volume 93 no. 6 p. 1362-1370 |
| spellingShingle | phosphorus fertilizers soil fertility yields upland rice George, Thomas Magbanua, Roger Roder, Walter Van Keer, Koen Trébuil, Guy Reoma, Veronica Upland rice response to phosphorus fertilization in Asia |
| title | Upland rice response to phosphorus fertilization in Asia |
| title_full | Upland rice response to phosphorus fertilization in Asia |
| title_fullStr | Upland rice response to phosphorus fertilization in Asia |
| title_full_unstemmed | Upland rice response to phosphorus fertilization in Asia |
| title_short | Upland rice response to phosphorus fertilization in Asia |
| title_sort | upland rice response to phosphorus fertilization in asia |
| topic | phosphorus fertilizers soil fertility yields upland rice |
| url | https://hdl.handle.net/10568/167019 |
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