Dear all! It is generally considered, that so called shallow EC from Veris instruments measures EC up to a depth of 30 cm (90% of EC response, if I understood correctly). However, out studies performed with MSP-3 in some fields in Poland indicated, that the correlation coeffficients for relationship between the shallow EC and weighted content of fine soil fractions calculated for the depth of 90 cm, were as significant, as for the same relationship to a depth of 30 cm, and sometimes even greater. Moreover, sometimes these coefficients were greater for shallow EC than for deep EC (officially corresponding to 90cm of depth). I know about one paper of Gebbers et al. (2009), investigating the depth of Veris (and other instruments), but someone know about other studies exploring the actual depth of EC scanning by Veris?
Thank you very much for your answer. Anyway, I think this paper does not explain, why the values of shallow EC from MSP-3 are stronger correlated with soil texture to a depth of 60 or 90 cm, than 30cm. Regards
I've done some analysis on soil particle size fractions and relate this to soil EC surveyed using Veris MSP and found the strongest correlation to EC shallow is from 5-10 cm whereas to EC deep is from 10-15 cm.
Guess we should refer to the relative signal rather than the accumulated signal in Gebber (2009)'s paper?
Also, I suspect the soil dryness may have something to do with the measurement depths?
Thank you for your answer, Guopeng. Hence, our experience is different and it would be interesting to explain way. I think that, apart of soil humidity, it is important to consider soil deeper layers, at least up to 100cm, or the presence of rock in case of shallower soils.
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