Estudio del fósforo en suelos de América Central. V. Uso de resinas de intercambio para evaluar la disponibilidad de P
The objective of this study was to evaluate the use anion exchange resin (Dowex 21K) as an index of P availability in 40 soils of Central America. The following determinations were undertaken, according to Cooke: 1. Initially available -kinetic- P (shaken 2 to 30 minutes) 2. Equilibration -intens...
| Main Authors: | , |
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| Format: | Artículo |
| Language: | Español |
| Published: |
Instituto Interamericano de Cooperación para la Agricultura (IICA)
2025
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| Subjects: | |
| Online Access: | https://repositorio.catie.ac.cr/handle/11554/13261 |
| Summary: | The objective of this study was to evaluate the use anion exchange resin (Dowex 21K) as an index of P availability in 40 soils of Central America.
The following determinations were undertaken, according to Cooke:
1. Initially available -kinetic- P (shaken 2 to 30 minutes)
2. Equilibration -intensity- P (shaken 18 hours)
3. Reserve -capacity- P (five successive extractions)
The kinetical criteria used to evaluate the dynamics of P during the first 30 minutes of contact of the soils with the resin indicated that P initially available is not a good index of measure the P absorbed by the plant.
For a group of 40 soils considered, the correlation between P adsorbed by the resin during 18 hours equlibration and the P absorbed by the tomato plants was 0.930, the correlation between reserve P measured by five successive equilibrations and absorbed P by tha plants was 0.951.
It was concluded that equilibration P and reserve P are the most significant parameters to evaluate that availability of P in the soils. Higher correlations obtained for the resin method as compared with other chemical procedures indicated that resin is better for the evaluation of P available in the soil. |
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