gjr80 <gjroder...@gmail.com> writes: > *cb* stands for *centibar* and is (I believe) a measure of the soil water > tension or the level of moisture held in the soil. Davis soil moisture > sensors read in centibars. Strictly speaking I guess that fields that > contain Ecowitt soil moisture data should be moved from *group_moisture* to > *group_percent*, though given there is no real need for inter-unit > conversion (à la temperature or speed) and they use the same default format > there is not much to be gained. True, the default unit label is different > but that can be easily overridden.
Soil moisture is very complicated. It sounds like Davis sensors are on the pro end of things with an absolute calibration. I have a WH51, not hooked up to weewx, and find that the % readings are useful over time to compare to other readings, but don't seem to have absolute calibration. When digging into this there are two moisture levels of primary interest for any particular soil type and ay particular plant: wilting level: the level below which the plant is unhappy due to dry saturation: the level you get to when the dirt/plant is in a long soaking rain, more or less For my plant, those were about 22% and 40% with the default calibration of the WH51 receiver. One can adjust those to make that range read 0 to 100, but I think that's only adjusting the display. I do think it would be good that Ecowitt % values not be mislabled as centibar, if my assumption they aren't centibar is correct. Some reading for those with a lot of Copious Spare Time. I'm not qualified to judge this, but it comes across as being from people that know what they are doing. https://www.metergroup.com/environment/articles/what-is-soil-moisture-science-behind-the-measurement/ -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/rmilfdopr3l.fsf%40s1.lexort.com.
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