Abstract
The design and construction of an apparatus for calibrating soil heat flux plates is described. The apparatus produces a known constant heat flux through a layer of an appropriate porous medium contained in a small, well-insulated box. A secondary heater, positioned below the primary heater, operates automatically to ensure that all the heat generated by the primary heater must flow upward through the box. The thermal conductivity of dry sand was calculated using this apparatus and the results agreed with previously published values. Soil heat fluxes in a wheat field measured using heat flux plates calibrated in the apparatus agreed with those calculated using an energy balance method.
Published Version
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