Soil and foliar phosphorus determination in Rwanda: Procedures and interpretation
Revised reference values of available soil phosphorus by Bray I below which bean (Phaseolus vulgaris L.) and sorghum (Sorghum bicolor L.) yield response to applied P is expected, were 6 and 9 ppm, for January and July soil sampling dates, respectively. Reference values determined for interpretation...
| Autores principales: | , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1996
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/44107 |
| _version_ | 1855542375348174848 |
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| author | Drechsel, Pay Mutwewingabo, B Hagedorn, F Wortmann, Charles S. |
| author_browse | Drechsel, Pay Hagedorn, F Mutwewingabo, B Wortmann, Charles S. |
| author_facet | Drechsel, Pay Mutwewingabo, B Hagedorn, F Wortmann, Charles S. |
| author_sort | Drechsel, Pay |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Revised reference values of available soil phosphorus by Bray I below which bean (Phaseolus vulgaris L.) and sorghum (Sorghum bicolor L.) yield response to applied P is expected, were 6 and 9 ppm, for January and July soil sampling dates, respectively. Reference values determined for interpretation of foliar test results of bean differed from those estimated previously. The critical foliar level of P concentration was estimated to be 0.40%. The importance of modifications of the Bray I procedure for soil P analysis was assessed using the modifications of three soil laboratories in Rwanda. Variations in shaking time, soil to extraction solution ratio, and soil sieve size were found to significantly affect available P values using the Bray I procedure. The modifications of one laboratory gave values which were 75% higher than those of the original Bray I procedure. Errors in preparation of standard solutions and in calculations resulted in values ranging from 2.5 to 300% of the correct value. |
| format | Journal Article |
| id | CGSpace44107 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1996 |
| publishDateRange | 1996 |
| publishDateSort | 1996 |
| record_format | dspace |
| spelling | CGSpace441072025-02-24T06:54:18Z Soil and foliar phosphorus determination in Rwanda: Procedures and interpretation Drechsel, Pay Mutwewingabo, B Hagedorn, F Wortmann, Charles S. soil testing tissue analysis leaves nutrient availability phosphorus phaseolus vulgaris análisis del suelo análisis de tejidos hojas disponibilidad de nutrientes fósforo Revised reference values of available soil phosphorus by Bray I below which bean (Phaseolus vulgaris L.) and sorghum (Sorghum bicolor L.) yield response to applied P is expected, were 6 and 9 ppm, for January and July soil sampling dates, respectively. Reference values determined for interpretation of foliar test results of bean differed from those estimated previously. The critical foliar level of P concentration was estimated to be 0.40%. The importance of modifications of the Bray I procedure for soil P analysis was assessed using the modifications of three soil laboratories in Rwanda. Variations in shaking time, soil to extraction solution ratio, and soil sieve size were found to significantly affect available P values using the Bray I procedure. The modifications of one laboratory gave values which were 75% higher than those of the original Bray I procedure. Errors in preparation of standard solutions and in calculations resulted in values ranging from 2.5 to 300% of the correct value. 1996 2014-10-02T08:33:15Z 2014-10-02T08:33:15Z Journal Article https://hdl.handle.net/10568/44107 en Open Access |
| spellingShingle | soil testing tissue analysis leaves nutrient availability phosphorus phaseolus vulgaris análisis del suelo análisis de tejidos hojas disponibilidad de nutrientes fósforo Drechsel, Pay Mutwewingabo, B Hagedorn, F Wortmann, Charles S. Soil and foliar phosphorus determination in Rwanda: Procedures and interpretation |
| title | Soil and foliar phosphorus determination in Rwanda: Procedures and interpretation |
| title_full | Soil and foliar phosphorus determination in Rwanda: Procedures and interpretation |
| title_fullStr | Soil and foliar phosphorus determination in Rwanda: Procedures and interpretation |
| title_full_unstemmed | Soil and foliar phosphorus determination in Rwanda: Procedures and interpretation |
| title_short | Soil and foliar phosphorus determination in Rwanda: Procedures and interpretation |
| title_sort | soil and foliar phosphorus determination in rwanda procedures and interpretation |
| topic | soil testing tissue analysis leaves nutrient availability phosphorus phaseolus vulgaris análisis del suelo análisis de tejidos hojas disponibilidad de nutrientes fósforo |
| url | https://hdl.handle.net/10568/44107 |
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