Responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under Striga hermonthica infestation
urple witchweed [Striga hermonthica (Del.) Benth.], here called just striga, parasitizes cereal crops in the savanna zone of sub-Saharan Africa. The objectives of this study were to investigate the expressions of a tolerant and a susceptible cultivar of maize (Zea mays L.) to striga as affected by t...
| Autores principales: | , |
|---|---|
| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1997
|
| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/103861 |
| _version_ | 1855530289913135104 |
|---|---|
| author | Kim, S.K. Adetimirin, Victor O. |
| author_browse | Adetimirin, Victor O. Kim, S.K. |
| author_facet | Kim, S.K. Adetimirin, Victor O. |
| author_sort | Kim, S.K. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | urple witchweed [Striga hermonthica (Del.) Benth.], here called just striga, parasitizes cereal crops in the savanna zone of sub-Saharan Africa. The objectives of this study were to investigate the expressions of a tolerant and a susceptible cultivar of maize (Zea mays L.) to striga as affected by timing (0, 2, 4, and 6 wk after maize planting) and rates (60 and 120 kg N ha−1) of N application under striga infestation. The experiment was designed as a split-split plot with four replications. Timing of N application and N rates significantly affected striga emergence, host-plant damage scores, agronomic traits, and grain yield. Nitrogen rate x application time interaction was highly significant for striga emergence. Time of N application was more important than N rate in suppressing striga emergence and host-plant damage. Nitrogen application at 2 wk after planting and 120 kg N ha−1 gave the best result in terms of maize performance and reduction of striga emergence. Host-plant damage symptoms were more useful in differentiating response of host genotypes to striga than striga emergence values. The tolerant cultivar (hybrid 8322-13) produced 188% higher grain yield than the susceptible cultivar (hybrid 8338-1) across all treatments. Grain yield of the tolerant cultivar at 60 kg N ha−1 was 88% higher than that of the susceptible cultivar at 120 kg N ha−1. The tolerant cultivar produced an average 157% more ears at 60 kg N ha−1 and 51% more ears at 120 kg N ha−1 than the susceptible cultivar. Among all the factors studied, the most important component for striga management was genetic tolerance, the ability of a host plant to withstand the parasite. |
| format | Journal Article |
| id | CGSpace103861 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1997 |
| publishDateRange | 1997 |
| publishDateSort | 1997 |
| record_format | dspace |
| spelling | CGSpace1038612024-01-17T12:58:34Z Responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under Striga hermonthica infestation Kim, S.K. Adetimirin, Victor O. maize timing nitrogen striga hermonthica urple witchweed [Striga hermonthica (Del.) Benth.], here called just striga, parasitizes cereal crops in the savanna zone of sub-Saharan Africa. The objectives of this study were to investigate the expressions of a tolerant and a susceptible cultivar of maize (Zea mays L.) to striga as affected by timing (0, 2, 4, and 6 wk after maize planting) and rates (60 and 120 kg N ha−1) of N application under striga infestation. The experiment was designed as a split-split plot with four replications. Timing of N application and N rates significantly affected striga emergence, host-plant damage scores, agronomic traits, and grain yield. Nitrogen rate x application time interaction was highly significant for striga emergence. Time of N application was more important than N rate in suppressing striga emergence and host-plant damage. Nitrogen application at 2 wk after planting and 120 kg N ha−1 gave the best result in terms of maize performance and reduction of striga emergence. Host-plant damage symptoms were more useful in differentiating response of host genotypes to striga than striga emergence values. The tolerant cultivar (hybrid 8322-13) produced 188% higher grain yield than the susceptible cultivar (hybrid 8338-1) across all treatments. Grain yield of the tolerant cultivar at 60 kg N ha−1 was 88% higher than that of the susceptible cultivar at 120 kg N ha−1. The tolerant cultivar produced an average 157% more ears at 60 kg N ha−1 and 51% more ears at 120 kg N ha−1 than the susceptible cultivar. Among all the factors studied, the most important component for striga management was genetic tolerance, the ability of a host plant to withstand the parasite. 1997 2019-10-03T14:30:46Z 2019-10-03T14:30:46Z Journal Article https://hdl.handle.net/10568/103861 en Limited Access Kim, S.K. & Adetimirin, V.O. (1997). Responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under Striga hermonthica infestation. Agronomy Journal, 89, 38-44. |
| spellingShingle | maize timing nitrogen striga hermonthica Kim, S.K. Adetimirin, Victor O. Responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under Striga hermonthica infestation |
| title | Responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under Striga hermonthica infestation |
| title_full | Responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under Striga hermonthica infestation |
| title_fullStr | Responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under Striga hermonthica infestation |
| title_full_unstemmed | Responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under Striga hermonthica infestation |
| title_short | Responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under Striga hermonthica infestation |
| title_sort | responses of tolerant and susceptible maize varieties to timimg and rate of nitrogen under striga hermonthica infestation |
| topic | maize timing nitrogen striga hermonthica |
| url | https://hdl.handle.net/10568/103861 |
| work_keys_str_mv | AT kimsk responsesoftolerantandsusceptiblemaizevarietiestotimimgandrateofnitrogenunderstrigahermonthicainfestation AT adetimirinvictoro responsesoftolerantandsusceptiblemaizevarietiestotimimgandrateofnitrogenunderstrigahermonthicainfestation |