SOIL, PLANT AND WATER REFERENCE METHOD FOR THE WESTERN REGION
has been developed as a guide of standard analytical methods for agricultural laboratories for use in the Western Region, byt the Western Coordinating Committee on Nutrient Management. This publication an update of Plant, Soil and Water Reference Methods for the Western Region, 1994, (WREP 125) written by Dr. Ray Gavlak formerly of the University of Alaska, Dr. Donald Horneck of Oregon State University, and Dr. Robert O. Miller of Colorado State University. These represent accepted methods for the analysis of soil and plant samples and were selected for the express purpose of identifying common methods on which a group of agricultural laboratories analytical results can be statistically evaluated.
The specific soil, plant and water analytical methods listed represent those analytical procedures that are
recommended for use in the current North American Proficiency Testing Program organized by the Soil
Science Society of America.