if I have clay content :
Clay (0-10cm of soil depth) = a %,
clay (10-20 cm of soil depth) = b%
what is clay content 0-20 cm of soil depth?
is it average of a and b?
the average value should be reasonable
It is the 10 to 20 percent which would represent the % at 15 cm.
Sorry, it is the average of 0-10 and 10-20. Read your question wrong. Too early in the morning to answer questions!
The average of the 0-10 and 10-20 cm should provide a good estimate. Just be careful and realize that this is just an estimate as many factors (genesis, climate, etc.) can affect its real value.
I would recommend reporting both depths separately. Probably a big difference between the two depths.
You can also process as this: (a%x10 + b%x10)/20
The gravimetric answer depends on the bulk densities of the two layers
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