PHCA (in calcium chloride) / PH2 (as specified in project report)

PHCA                pH in calcium chloride.
PH2                 pH as specified in project report.

          mineral horizon     2-10; may be -9 if KIND=U or N
          organic horizon     2-10; may be -9 if KIND=U or N
          R,W                 -9

          If PHCA<5, then CACO3 must be 0 and BASES must be <100.