The dramatic rolling hills of the inland Pacific Northwest (iPNW), formed from deep deposits of volcanic ash and wind‐blown loess, feature some of the world's most productive soils. Alarmingly, a growing trend of extremely low‐pH values in these soils represents a serious threat to land quality, value, and productivity. Earn 1.5 CEU in Soil and Water Management by reading this article and completing the quiz at www.certifiedcropadviser.org/certifications/self‐study/702 .
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McFarland et al. (2015) studied this question.
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