1.Installation into Duplex Soils
Clay
Sand
Installation of the Drill & Drop probe into soils with a strong textural
difference in the A and B horizons requires pre-drilling of the hole
with a an undersized non-tapered auger first, followed by the
tapered one.
In the example shown, this is done to prevent the deposition of
lower layer clay shavings transported up the auger flight into the
upper sandy layer (or vice-versa).
The sensor should only be measuring the sandy texture without any
dispersed clay shavings within it.
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