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Eastern Oregon Liming Guide

Dan Sullivan, Donald Horneck and, Donald Wysocki (May, 2013)

Summary

Soils of the inland Pacific Northwest (PNW) were generally alkaline before cultivation began, with the exception of some higher rainfall areas. Virgin soils contained highly variable amounts of carbonate (naturally occurring lime). Today, however, broad areas, including the Columbia Basin and Palouse, have acidic soil (pH below 6.0) as a result of past farming practices.