17. Utility Functions

17.1. Pedotransfer Functions (PTFs)

Soil bulk density may be derived using one of the two PTFs below, depending on the availaability of other data.

Equation 17.1

where:

is the percentage of soil organic carbon.

is the percentage of sand in the soil.

is the percentage of clay in the soil.
Equation 17.2

17.2. pH conversion

Equation 17.3

where:

is the pH determined in KCl solution.

is the pH determined in water.

is the pH determined in CaCl2 solution.

is the pH of the soil solution.

is the concentration of H+ in the soil solution.