Efficiency of nitrogen acquisition and utilisation in common bean in Uganda
Inadequate nitrogen nutrition is a major constraint to the performance of common bean (Phaseolus vulgaris L.) in sub-Saharan Africa. Twenty six lines selected for good performance under N-limiting conditions were further evaluated at two locations in Uganda to determine the mechanisms allowing good...
| Autores principales: | , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1998
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/43402 |
| _version_ | 1855515305523019776 |
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| author | Wortmann, Charles S. Silver-Rwakaikara, M Lynch, J |
| author_browse | Lynch, J Silver-Rwakaikara, M Wortmann, Charles S. |
| author_facet | Wortmann, Charles S. Silver-Rwakaikara, M Lynch, J |
| author_sort | Wortmann, Charles S. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Inadequate nitrogen nutrition is a major constraint to the performance of common bean (Phaseolus vulgaris L.) in sub-Saharan Africa. Twenty six lines selected for good performance under N-limiting conditions were further evaluated at two locations in Uganda to determine the mechanisms allowing good performance under soil N-limiting conditions. Two non-nodulating lines were included whose mean yield was 44% more with N application. The test lines showed little response to applied N implying that all fixed significant amounts of N2; N derived from the atmosphere was estimated to average 15 and 43% of plant N for two locations using the natural abundance 15N technique. Mean yield of test lines ranged from 810 to 1450 kg ha-1 across two locations with N-limiting conditions. Characteristics contributing to good performance under N-limiting conditions varied with genotypes which were grouped into two clusters, with four out-lying genotypes, based on N acquisition and utilisation characteristics. Nitrogen utilisation efficiency in vegetative growth was not important to yield under N-limiting conditions. Increased N acquisition during podfill was important to the yield of some genotypes, and presumably compensated for less biomass and plant N at the beginning of podfill. Yield was positively related to biomass and plant N at physiological maturity (R9), but not to N utilisation efficiency in biomass production at R9. Efficient partitioning of N from the vegetative parts to the grain was important to growth under N-limiting conditions, as was N utilisation efficiency in grain formation. |
| format | Journal Article |
| id | CGSpace43402 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1998 |
| publishDateRange | 1998 |
| publishDateSort | 1998 |
| record_format | dspace |
| spelling | CGSpace434022023-02-15T05:10:58Z Efficiency of nitrogen acquisition and utilisation in common bean in Uganda Wortmann, Charles S. Silver-Rwakaikara, M Lynch, J phaseolus vulgaris nitrogen fertilizers arable soils biomass abonos nitrogenados biomasa suelos cultivables Inadequate nitrogen nutrition is a major constraint to the performance of common bean (Phaseolus vulgaris L.) in sub-Saharan Africa. Twenty six lines selected for good performance under N-limiting conditions were further evaluated at two locations in Uganda to determine the mechanisms allowing good performance under soil N-limiting conditions. Two non-nodulating lines were included whose mean yield was 44% more with N application. The test lines showed little response to applied N implying that all fixed significant amounts of N2; N derived from the atmosphere was estimated to average 15 and 43% of plant N for two locations using the natural abundance 15N technique. Mean yield of test lines ranged from 810 to 1450 kg ha-1 across two locations with N-limiting conditions. Characteristics contributing to good performance under N-limiting conditions varied with genotypes which were grouped into two clusters, with four out-lying genotypes, based on N acquisition and utilisation characteristics. Nitrogen utilisation efficiency in vegetative growth was not important to yield under N-limiting conditions. Increased N acquisition during podfill was important to the yield of some genotypes, and presumably compensated for less biomass and plant N at the beginning of podfill. Yield was positively related to biomass and plant N at physiological maturity (R9), but not to N utilisation efficiency in biomass production at R9. Efficient partitioning of N from the vegetative parts to the grain was important to growth under N-limiting conditions, as was N utilisation efficiency in grain formation. 1998 2014-09-24T08:42:05Z 2014-09-24T08:42:05Z Journal Article https://hdl.handle.net/10568/43402 en Open Access |
| spellingShingle | phaseolus vulgaris nitrogen fertilizers arable soils biomass abonos nitrogenados biomasa suelos cultivables Wortmann, Charles S. Silver-Rwakaikara, M Lynch, J Efficiency of nitrogen acquisition and utilisation in common bean in Uganda |
| title | Efficiency of nitrogen acquisition and utilisation in common bean in Uganda |
| title_full | Efficiency of nitrogen acquisition and utilisation in common bean in Uganda |
| title_fullStr | Efficiency of nitrogen acquisition and utilisation in common bean in Uganda |
| title_full_unstemmed | Efficiency of nitrogen acquisition and utilisation in common bean in Uganda |
| title_short | Efficiency of nitrogen acquisition and utilisation in common bean in Uganda |
| title_sort | efficiency of nitrogen acquisition and utilisation in common bean in uganda |
| topic | phaseolus vulgaris nitrogen fertilizers arable soils biomass abonos nitrogenados biomasa suelos cultivables |
| url | https://hdl.handle.net/10568/43402 |
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