Estudio del fósforo en suelos de América Central. V. Uso de resinas de intercambio para evaluar la disponibilidad de P
No hay miniatura disponible
Fecha
Autores
Título de la revista
ISSN de la revista
Título del volumen
Editor
Instituto Interamericano de Cooperación para la Agricultura (IICA)
Resumen
Descripción
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.
Palabras clave
Fósforo||phosphorus||Fósforo||phosphore, Suelo||soil||solo||sol, Química del suelo||soil chemistry||Química do solo||chimie du sol, América Central||Central America||América Central||Amérique centrale, Resina||resins||resina||résine, Anión||anions||anion||anion, Estado nutricional||nutritional status||estado da nutrição||état nutritionnel, Sede Central