...Fig. 2. The relationship between volumetric root content ( R v ) and dielectric permittivity (ε r ), shown with the standard deviation of the measurements plotted as error bars. The regression fit to the data is shown in black (equation at bottom of figure) with the 95% confidence interval...

... and irrigation using volumetrically controlled water content under different gravity environments revealed similar hydraulic responses in fine-textured porous media typically unsuitable for plant growth in greenhouses. Volumetric water content–based management of plant root environments appears to be a safer...

...Fig. 4. Square root of the dielectric permittivity vs. volumetric water content for Industrial Paragon Sand (No. 30) and municipal water during upward infiltration. Each symbol represents measurements made in a separate calibration experiment. The column was repacked with dry sand for each...

... since the 1970s. Consequently, understanding root water uptake under water-stressed conditions is gaining importance. The performance of a recently developed polymer tensiometer (POT) designed to measure matric potentials down to −1.6 MPa was evaluated and compared with volumetric moisture content...

...J. M. Basinger; G. J. Kluitenberg; J. M. Ham; J. M. Frank; P. L. Barnes; M. B. Kirkham Abstract The dual-probe heat-pulse (DPHP) method provides a means of estimating volumetric soil water content (θ) and change in volumetric water content (Δθ) from measurements of volumetric heat capacity...

..., steeply dipping spill-over foresets, and loading features. Burrowing and pyrite nodules are present in the lower part and coarse organic debris and roots are common in the uppermost part. Poorly drained swamps are best recognized by their high content of organic fragments and root bioturbation...

... measured volumetric water content, the root mean square error (RMSE) of θ TDR measurements was 0.023 m 3 m −3 for repacked soils and 0.018 m 3 m −3 for undisturbed soils. The RMSE of θ HP measurements was 0.022 m 3 m −3 for repacked soils and 0.021 m 3 m −3 for undisturbed soils. The relatively large RMSE...

... locations within the trench face to measure volumetric water contents. A multi-port telescopic boom type rainfall simulator was used to provide artificial rainfall on the plot. Six rainfall simulations and two dye-tracer tests were conducted on the plot during a 7-mo period. Subsurface flow was visually...