Results of the reconaissance soil survey of the Bio-Bio Zone, are presented. The area under study covers 910,000 acres. Eighteen soil series are described under six broad groups groups. Land use and conservation problems which are extensivily discussed, include soil erosion, affecting 34% oí the soil studied; management of 250.000 acres of sandy soils; irrigation of new lands; reforestation of land not suited for cropping, etc.
A soil and erosion map of the area is also presented.

1 Ingeniero Agronómo Jefe de la Sección Conservación de Suelo del Depto. de Investigaciones Agrícolas del Ministerio de Agricultura