Ramón García L.1 y Manuel J. Gandarillas I.1

Wheat response to nitrogen fertilizer was calibrated with an aerobic incubation soil test for nitrogen availability. Samples from 62 fertilizer experiment in the irrigated Central Valley of Chile were used for the study.
Initial inorganic soil nitrogen (initial-N) gave the best correlaton (r=0,804) with wheat nitrogen response.
A high response was found in soils showing analitical values of 0-15 ppm initial-N. Medium, uncertain and no response were found in soils with analitycal values of 15.1-30.0; 30.1-50.0; and over 50.1 initial N respectively.

1Ings. Agrs., M. S., Proyecto Suelos, Estación Experimental La Platina, Instituto de Investigaciones Agropecuarias (INIA), Casilla 5427, Santiago, Chile.