code: public static String calcAdjustedMoisture33Kpa(String slsnd, String slcly, String omPct, String df) {
  
          String mt33 = calcMoisture33Kpa(slsnd, slcly, omPct);
          String satMt = calcSaturatedMoisture(slsnd, slcly, omPct);
          String adjSatMt = calcAdjustedSaturatedMoisture(slsnd, slcly, omPct, df);
          String ret = substract(mt33, product(substract(satMt, adjSatMt), "0.2"));
          LOG.debug("Calculate result for 33 kPa moisture, adjusted density, ([0,100]%) is {}", ret);
          return ret;
      }
docs: Equation 9 for calculating 33 kPa moisture, adjusted density,([0,100]%)
  
  @param slsnd Sand weight percentage by layer ([0,100]%)
  @param slcly Clay weight percentage by layer ([0,100]%)
  @param omPct Organic matter weight percentage by layer ([0,100]%), (=
  SLOC * 1.72)
  @param df Density adjustment Factor (0.9–1.3)