ABSTRACT
ONE PROFILE OF VOLCANIC ASH SOIL OF THE SANTA BARBARA SOIL ASSOCIATION WAS SAMPLED

Jan Vanderdeelen1, Inés Pino N.2 y León Baert.3
 

The distribution of phosphates in the soil was studied and the fractions fixing the P added in inorganic form were determined.
It was shown that the phosphorous fixed on the P-Al fraction decreases with depth, but the fraction P-Fe shows an opposite tendency.
A Na2CO3 extraction indicated that Si was partly responsible for the Al inactivation because it was not detected with oxalate extraction.

Keywords:
1Doctor. facultad de Ciencias Agrícolas de la Universidad del Estado de Gante. 9000 Gent, Bélgica.
2Ing. Agr. Departamento de Ingeniería y Suelos, Facultad de Agronomía, Universidad de Chile. Casilla 1004, Santiago, Chile.
3Doctor. Facultad de Ciencias Agrícolas de la Universidad del Estado de Gante. 9000 Gent, Bélgica.