ABSTRACT.


VARDA GUTNIK1, JOSEPH BALCAR2, HAROLD BEHRENS3, EDMUNDO ACEVEDO4
 

The change in phosphorous fixation at various pH levels (4,5-9,5) in two volcanic ash soils of Chile, which differ in their Al content extracted at pH 4,8, was observed.
The amount of P fixed by soils in each pH level is directly related to the extractable Al of the soil.
The fixation is highly reduced over pH 7,0.
A possible mechanism for the phenomena is discussed.

Keywords:
1 Químico M. S. Departamento Suelos, Facultad de Agronomía, Universidad de Chile
2 Ingeniero Agrónomo Ph. D. Experto O.I.E.A.
3 Químico Ph. D. Laboratorio Radioquímica, Facultad Ciencias Físicas y Matemáticas, Universidad de Chile.
4 Ingeniero Agrónomo, Profesor Auxiliar Cátedra Suelos, Facultad de Agronomía, Universidad de Chile.