Soil texture analysis revisited: Removal of organic matter matters more than ever.

This point of change was highly significant ( p <0.001), and the following piecewise linear regression equation can be used to model the underestimation of clay (UnClay) at Highfield: (2) UnClay = − 0.78 ( p = 0.19 ) + 0.66 ( p = 0.07 ) SOC + 5.22 ( p < 0.001 ) ( SOC − 2.27 ) + , R 2 = 0.90 The last term in the equation is only applicable for SOC contents above 2.27 g C 100 g -1 minerals.

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