The Effect of Air Drying on the Hydrogen-Ion Concentration of the Soils of the United States and Canada - Tapa blanda

This document is part of the United States Department of Agriculture's Organic
Roots Collection. Organic Roots is a collection of the historic United States
Department of Agriculture. The collection contains publications related to organic
agriculture. The collection contains documents published before 1942 (before
synthetic chemicals became widely used) that contain state-of-the-art information
and data that is still very pertinent for today's agriculture.