Calibration equations for Diviner 2000 capacitance measurements of volumetric soil water content of six soils

Calibration coefficients for a Diviner 2000 capacitance sensor were developed under laboratory conditions for soils of six textures. The calibration equations, derived by regression analysis, significantly ( P <0.001) related Diviner 2000 measurements of scaled frequency (SF) with volumetric soil water content of the soil. In all cases the calibration accounted for >93% of the variation ( R 2 adjusted) with the volumetric water content of the soil.