Principle

The amount or Organic Carbon available for plant growth.

Calibration

Use the colour cards to calibrate for Organic Carbon.

  • Take the colour card for 0% Organic Carbon.
  • Place the cuvette under the light stand with the card over it.
  • Clip on the ring light over your phone and turn it on to maximum brightness
  • Place the phone over the stand
  • Go to Settings > Colorimetric Test > Calibrate and choose Organic Carbon
  • Select the calibration point, 0 in this case
  • Click on Start Camera
  • Position the cuvette so that the middle, most uniformly lit portion is within the circle.
  • Select Analyze
  • You should have your first calibration point. Repeat similarly with the other calibration points.

Test

  • Take 0.5 gm of soil in the small measuring tube.
  • Add 5 ml of Organic Carbon Reagent A
  • Add 5 ml of Organic Carbon Reagent B
  • Shake well and leave for 5 minutes
  • Filer and place it the white cuvette.
  • From the home screen choose Colorimetric Test > Soil > Organic Carbon
  • Choose No Dilution if this is the first test, you might have to dilute the sample and retry later if you get an error.
  • Click on Start Camera
  • Position the cuvette so that the middle, most uniformly lit portion is within the circle.
  • Select Analyze
  • After some time, the app will display a result.