What is wrong with calibrating by adding a known weight of water to a known volume of soil and using the soil weight loss-over-time to correlate probe output with VWC?
Although, fundamentally, the evaporative weight loss of a soil should determine the change in VWC, the amount of water lost from the system will not be uniform across the vertical profile of the soil. Thus, even if the overall soil VWC has changed 5%, the actual VWC of the soil nearest the probe may have changed very little. Because of the likelihood of non-uniform wetting and drying, we encourage calibration using the procedure we define in our application note referenced above.
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