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|12 - 40 ppm||As measured by the '
Bray' method. Alternatives include 'Mehlich I or III', or ' Olsen'. Results from these are not directly translatable.<ref>Sawyer JE, Mallarino AP. Differentiating and Understanding the Mehlich 3, Bray, and Olsen Soil Phosphorus Tests 1. http://www.agronext.iastate.edu/soilfertility/info/mnconf11_22_99.pdf. Accessed August 1, 2017.</ref>
![[Cationic exchange capacity(CEC)]]