Nicasio Rodríguez S.1 y José F. Araos F.2

No significant difference was found between the ascorbic acid and the stannous chloride methods in determining soil extractable P by the Olsen procedure. Soil samples were from the central valley in Ñuble. The ascorbic acid technique, as used in the Soil Testing Laboratory of Quilamapu Experiment Station, is described in this paper. This technique has practical advantages over the stannous chloride method.

1Ing. Agr. Estación Experimental Quilamapu Instituto de Investigaciones Agropecuarias, Casilla 426, Chillán, Chile.
2Ing. Agr. MS, Estación Experimental Quilamapu, Instituto de Investigaciones Agropecuarias.
3Araos, F. J. Información no publicada.