On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice
Measurements of N uptake by rice plants growing in a puddled flooded soil and the corresponding changes in soil solution NH: concentrations and the soil NH: diffusion coefficient are used to calculate how far root uptake properties and transport to the roots limit acquisition of N by rice. With root...
| Main Authors: | , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Wiley
1997
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/166328 |
| _version_ | 1855514860041797632 |
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| author | Kirk, G.J.D. Solivas, J.L. |
| author_browse | Kirk, G.J.D. Solivas, J.L. |
| author_facet | Kirk, G.J.D. Solivas, J.L. |
| author_sort | Kirk, G.J.D. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Measurements of N uptake by rice plants growing in a puddled flooded soil and the corresponding changes in soil solution NH: concentrations and the soil NH: diffusion coefficient are used to calculate how far root uptake properties and transport to the roots limit acquisition of N by rice. With root uptake parameters assigned values such that influx was maximal within realistic ranges, the minimum root length densities required to explain uptake were similar to measured root length densities in both N‐fertilized and unfertilized soil. This suggests that most if not all of the root length was active in uptake and that uptake per unit root length was near maximal. A sensitivity analysis showed that the necessary minimum root length is very sensitive to root uptake properties within appropriate ranges. Transport to the roots was mainly by diffusion. Rates of diffusion will generally not limit uptake in well‐puddled soils, but they may greatly limit uptake in puddled soils that have been drained and re‐flooded and in unpuddled flooded soils. Uptake of fertilizer N broadcast into rice field floodwater and absorbed by roots in the floodwater or soil near the floodwater is not likely to be limited by root uptake properties or transport. |
| format | Journal Article |
| id | CGSpace166328 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1997 |
| publishDateRange | 1997 |
| publishDateSort | 1997 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1663282025-05-14T10:39:28Z On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice Kirk, G.J.D. Solivas, J.L. roots transport soil nitrogen uptake flooded land lowland rice Measurements of N uptake by rice plants growing in a puddled flooded soil and the corresponding changes in soil solution NH: concentrations and the soil NH: diffusion coefficient are used to calculate how far root uptake properties and transport to the roots limit acquisition of N by rice. With root uptake parameters assigned values such that influx was maximal within realistic ranges, the minimum root length densities required to explain uptake were similar to measured root length densities in both N‐fertilized and unfertilized soil. This suggests that most if not all of the root length was active in uptake and that uptake per unit root length was near maximal. A sensitivity analysis showed that the necessary minimum root length is very sensitive to root uptake properties within appropriate ranges. Transport to the roots was mainly by diffusion. Rates of diffusion will generally not limit uptake in well‐puddled soils, but they may greatly limit uptake in puddled soils that have been drained and re‐flooded and in unpuddled flooded soils. Uptake of fertilizer N broadcast into rice field floodwater and absorbed by roots in the floodwater or soil near the floodwater is not likely to be limited by root uptake properties or transport. 1997-12 2024-12-19T12:56:08Z 2024-12-19T12:56:08Z Journal Article https://hdl.handle.net/10568/166328 en Wiley KIRK, G. J. D.; SOLIVAS, J. L. 1997. On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice. European J Soil Science, Volume 48 no. 4 p. 613-621 |
| spellingShingle | roots transport soil nitrogen uptake flooded land lowland rice Kirk, G.J.D. Solivas, J.L. On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice |
| title | On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice |
| title_full | On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice |
| title_fullStr | On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice |
| title_full_unstemmed | On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice |
| title_short | On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice |
| title_sort | on the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice |
| topic | roots transport soil nitrogen uptake flooded land lowland rice |
| url | https://hdl.handle.net/10568/166328 |
| work_keys_str_mv | AT kirkgjd ontheextenttowhichrootpropertiesandtransportthroughthesoillimitnitrogenuptakebylowlandrice AT solivasjl ontheextenttowhichrootpropertiesandtransportthroughthesoillimitnitrogenuptakebylowlandrice |