Temporal origin of nitrogen in the grain of tropical wet-season rice
The total N in the grain is the integral of the product of the total N absorbed at any instant and the fraction of that N eventually allocated to the grain. We investigated the temporal origin of N in the grain of a wet season rice crop and tested the suitability of 15N nitrate (NH4 15NO3) as a labe...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Wiley
2005
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/166737 |
| _version_ | 1855518321444651008 |
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| author | Sheehy, J.E. Mnzava, M. Cassman, K.G. Mitchell, P.L. Ferrer, A.B. Robles, R.P. Pablico, P. |
| author_browse | Cassman, K.G. Ferrer, A.B. Mitchell, P.L. Mnzava, M. Pablico, P. Robles, R.P. Sheehy, J.E. |
| author_facet | Sheehy, J.E. Mnzava, M. Cassman, K.G. Mitchell, P.L. Ferrer, A.B. Robles, R.P. Pablico, P. |
| author_sort | Sheehy, J.E. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The total N in the grain is the integral of the product of the total N absorbed at any instant and the fraction of that N eventually allocated to the grain. We investigated the temporal origin of N in the grain of a wet season rice crop and tested the suitability of 15N nitrate (NH4 15NO3) as a label for that purpose. The total N content of rice (Oryza sativa L.) plants was measured by growth analysis throughout the duration of the crop and the measurements were used to calculate the rate of total N uptake. A point‐placement technique was used to deliver small amounts of 15N nitrate to roots of the rice plant and this enabled the eventual fate of the total N absorbed at any time to be determined. The rate at which N was acquired by the panicle exceeded that by the whole plant at 64 d after transplanting (DAT); thereafter, N was transferred from the leaves to the panicle. About 60% of N in the grain was acquired before panicle initiation and was transferred from leaves during grain filling. A comparison between the uptake and retention of labeled nitrate and urea applied separately at 35 DAT showed that 21 and 58% of the 15N nitrate and 15N urea, respectively, were recovered. There were no advantages of using 15N nitrate as opposed to 15N urea as a label in such research of irrigated rice. |
| format | Journal Article |
| id | CGSpace166737 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2005 |
| publishDateRange | 2005 |
| publishDateSort | 2005 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1667372025-05-14T10:39:33Z Temporal origin of nitrogen in the grain of tropical wet-season rice Sheehy, J.E. Mnzava, M. Cassman, K.G. Mitchell, P.L. Ferrer, A.B. Robles, R.P. Pablico, P. ammonium nitrate chemical composition leaves nitrate nitrogen nitrogen content nitrogen fertilizers nutrient uptake panicles plant nutrition roots urea use efficiency philippines The total N in the grain is the integral of the product of the total N absorbed at any instant and the fraction of that N eventually allocated to the grain. We investigated the temporal origin of N in the grain of a wet season rice crop and tested the suitability of 15N nitrate (NH4 15NO3) as a label for that purpose. The total N content of rice (Oryza sativa L.) plants was measured by growth analysis throughout the duration of the crop and the measurements were used to calculate the rate of total N uptake. A point‐placement technique was used to deliver small amounts of 15N nitrate to roots of the rice plant and this enabled the eventual fate of the total N absorbed at any time to be determined. The rate at which N was acquired by the panicle exceeded that by the whole plant at 64 d after transplanting (DAT); thereafter, N was transferred from the leaves to the panicle. About 60% of N in the grain was acquired before panicle initiation and was transferred from leaves during grain filling. A comparison between the uptake and retention of labeled nitrate and urea applied separately at 35 DAT showed that 21 and 58% of the 15N nitrate and 15N urea, respectively, were recovered. There were no advantages of using 15N nitrate as opposed to 15N urea as a label in such research of irrigated rice. 2005-05 2024-12-19T12:56:35Z 2024-12-19T12:56:35Z Journal Article https://hdl.handle.net/10568/166737 en Wiley Sheehy, J. E.; Mnzava, M.; Cassman, K. G.; Mitchell, P. L.; Ferrer, A. B.; Robles, R. P. and Pablico, P. 2005. Temporal origin of nitrogen in the grain of tropical wet-season rice. Agronomy Journal, Volume 97 no. 3 p. 698-704 |
| spellingShingle | ammonium nitrate chemical composition leaves nitrate nitrogen nitrogen content nitrogen fertilizers nutrient uptake panicles plant nutrition roots urea use efficiency philippines Sheehy, J.E. Mnzava, M. Cassman, K.G. Mitchell, P.L. Ferrer, A.B. Robles, R.P. Pablico, P. Temporal origin of nitrogen in the grain of tropical wet-season rice |
| title | Temporal origin of nitrogen in the grain of tropical wet-season rice |
| title_full | Temporal origin of nitrogen in the grain of tropical wet-season rice |
| title_fullStr | Temporal origin of nitrogen in the grain of tropical wet-season rice |
| title_full_unstemmed | Temporal origin of nitrogen in the grain of tropical wet-season rice |
| title_short | Temporal origin of nitrogen in the grain of tropical wet-season rice |
| title_sort | temporal origin of nitrogen in the grain of tropical wet season rice |
| topic | ammonium nitrate chemical composition leaves nitrate nitrogen nitrogen content nitrogen fertilizers nutrient uptake panicles plant nutrition roots urea use efficiency philippines |
| url | https://hdl.handle.net/10568/166737 |
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