Fig. 6. Predicted values of volumetric water content (^') from dual-probe heat-pulse (DPHP) sensors compared with volumetric water content () determined by soil sampling for all sites and sampling times. Values of ^' were obtained from Eq. [8]. Each circle represents the mean of five ^' values and the mean from 10 soil samples at a given site and sampling time. The dashed line is the regression model.