Variation in growth and N2 fixation within and among Centrosema spp. in response to phosphorus supply
Four inoculated ecotypes of each of Centrosema acutifolium, C. brasilianum and C. macrocarpum were grown in undisturbed soil (oxisol) cores in a glasshouse to study their response to 7 phosporus levels (a total of 11, 22, 45, 90, 180, 360 and 720 mg/core P, surface applied as Ca(H2PO4)2.H2O). Seven...
| Autores principales: | , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1992
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/44219 |
| _version_ | 1855531159373479936 |
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| author | Cadisch, Georg Sylvester-Bradley, Rosemary Nosberger, J |
| author_browse | Cadisch, Georg Nosberger, J Sylvester-Bradley, Rosemary |
| author_facet | Cadisch, Georg Sylvester-Bradley, Rosemary Nosberger, J |
| author_sort | Cadisch, Georg |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Four inoculated ecotypes of each of Centrosema acutifolium, C. brasilianum and C. macrocarpum were grown in undisturbed soil (oxisol) cores in a glasshouse to study their response to 7 phosporus levels (a total of 11, 22, 45, 90, 180, 360 and 720 mg/core P, surface applied as Ca(H2PO4)2.H2O).
Seven weeks after planting, dry matter production, leaf area, N yield, nodulation, nodule-P concentration and acetylene reduction activity increased strongly with P supply. Enhanced leaf area was due mainly to increases in individual leaf size, especially in the large-leaved C. macrocarpum. Shoot-N concentration of all species increased with P supply, which was attributed to increased nodule mass and N2 fixation, but not to a greater proportion of leaf material.
The response to P supply in leaf number, leaf size and leaf-to-stem ratio as well as nodule number and weight differed among species. However, there was no significant (P > 0.05) species × P rate interactions for dry matter and N yield, shoot-N %, or nodule-P %, but strong intra-specific variation was found. All 3 Centrosema species contain important genetic variability in the growth and N2 fixation responses to P supply during establishment. Therefore both parameters should be taken into account in selecting ecotypes. |
| format | Journal Article |
| id | CGSpace44219 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1992 |
| publishDateRange | 1992 |
| publishDateSort | 1992 |
| record_format | dspace |
| spelling | CGSpace442192021-10-09T05:52:38Z Variation in growth and N2 fixation within and among Centrosema spp. in response to phosphorus supply Cadisch, Georg Sylvester-Bradley, Rosemary Nosberger, J feed crops centrosema phosphate fertilizers nitrogen fixation growth leaf area yields abonos fosfatados fijación del nitrógeno crecimiento superficie foliar rendimiento Four inoculated ecotypes of each of Centrosema acutifolium, C. brasilianum and C. macrocarpum were grown in undisturbed soil (oxisol) cores in a glasshouse to study their response to 7 phosporus levels (a total of 11, 22, 45, 90, 180, 360 and 720 mg/core P, surface applied as Ca(H2PO4)2.H2O). Seven weeks after planting, dry matter production, leaf area, N yield, nodulation, nodule-P concentration and acetylene reduction activity increased strongly with P supply. Enhanced leaf area was due mainly to increases in individual leaf size, especially in the large-leaved C. macrocarpum. Shoot-N concentration of all species increased with P supply, which was attributed to increased nodule mass and N2 fixation, but not to a greater proportion of leaf material. The response to P supply in leaf number, leaf size and leaf-to-stem ratio as well as nodule number and weight differed among species. However, there was no significant (P > 0.05) species × P rate interactions for dry matter and N yield, shoot-N %, or nodule-P %, but strong intra-specific variation was found. All 3 Centrosema species contain important genetic variability in the growth and N2 fixation responses to P supply during establishment. Therefore both parameters should be taken into account in selecting ecotypes. 1992 2014-10-02T08:33:26Z 2014-10-02T08:33:26Z Journal Article https://hdl.handle.net/10568/44219 en Open Access |
| spellingShingle | feed crops centrosema phosphate fertilizers nitrogen fixation growth leaf area yields abonos fosfatados fijación del nitrógeno crecimiento superficie foliar rendimiento Cadisch, Georg Sylvester-Bradley, Rosemary Nosberger, J Variation in growth and N2 fixation within and among Centrosema spp. in response to phosphorus supply |
| title | Variation in growth and N2 fixation within and among Centrosema spp. in response to phosphorus supply |
| title_full | Variation in growth and N2 fixation within and among Centrosema spp. in response to phosphorus supply |
| title_fullStr | Variation in growth and N2 fixation within and among Centrosema spp. in response to phosphorus supply |
| title_full_unstemmed | Variation in growth and N2 fixation within and among Centrosema spp. in response to phosphorus supply |
| title_short | Variation in growth and N2 fixation within and among Centrosema spp. in response to phosphorus supply |
| title_sort | variation in growth and n2 fixation within and among centrosema spp in response to phosphorus supply |
| topic | feed crops centrosema phosphate fertilizers nitrogen fixation growth leaf area yields abonos fosfatados fijación del nitrógeno crecimiento superficie foliar rendimiento |
| url | https://hdl.handle.net/10568/44219 |
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