ABSTRACT.


José F. Araos F.1
 

The Olsen, Bray Nº 1, Bray Nº2, Truog and North Carolina methods were compared as to their reliability in estimating P avalability on irrigated soils in Ñuble. The simple correlations were calculated between the wheat response to P, in field experiments, and the logarithms of the amounts of P extracted by each method. Eleven experiments were carried out on red soils (alfisols), 11 in trumao soils (andepts) and 11 in miscelaneous soils.

Keywords:
1Ing. Agr. M. S., Centro de Apoyo Suelos, Estación Experimental La Platina, Instituto de Investigaciones Agropecuarias, Casilla 5427, Santiago, Chile.