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RESTR_TYPE - Type of Root Restricting Layer

RESTR_TYPE must be - if ROOTRESTR is - or 0.
Otherwise one of those on the allowable list.

Allowable List

-	Not Applicable
UN	Undifferentiated
BN	Solonetzic B horizon
SA	Salinity (conductivity > 4dS/m)
CT	Compact (Basal) Till
OR	Ortstein horizon
FP	Fragipan
LI	Lithic (consolidated bedrock)
CR	Cryic (frozen) horizon
DU	Duric horizon
PL	Placic horizon