Using a CS650 or a CS655, when should a soil-specific calibration be performed?

To get accurate water content readings, a soil-specific calibration is probably required if any of the following are true:

  • The soil has more than 5% organic matter content.
  • The soil has more than 20% clay content.
  • The soil is derived from volcanic parent material.
  • The soil has porosity greater than 0.5.

For details on performing a soil-specific calibration, refer to “The Water Content Reflectometer Method for Measuring Volumetric Water Content” section in the CS650/CS655 manual.

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