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25 Feb 2016IPNI 2015 North American Soil Test Summary Results

Official Results Released from IPNI 2015 North American Soil Test Summary.

08 Feb 2013Northeastern US Soil Test P

Soil Test Summaries

08 Feb 2013Northeastern US Soil Test K

Soil Test Summaries

08 Feb 2013Eastern Canada Soil Test P

Soil Test Summaries

08 Feb 2013Eastern Canada Soil Test K

Soil Test Summaries

08 Feb 2013Soil Fertility Distributions, 2001-2010

IPNI 2010 Soil Test Summary

05 Dec 2012The Fertility of North American Soils, 2010

Paul E. Fixen, Tom W. Bruulsema, Tom L. Jensen, Robert Mikkelsen, T. Scott Murrell, Steve B. Phillips, Quentin Rund, and W. Mike Stewart