2.1 Brix (%) & (Fuzzy)

Brix (%) and Brix (Fuzzy)

Soil health indicator: brix reading on a scale of 0-30

“With Brix you are measuring the light refracting through the dissolved solids on the screen of this sawn-off little telescope. You are literally measuring nutrient density or, more accurately, your skills as a chlorophyll manager.”


  • Refractometer (0-32%)
  • Heavy duty Garlic Crusher
  • Water Squirt Bottle (optional)
  • Dry cloth/kitchen roll
  • Quadrat (optional)

Doing test:

  1. Decide whether you want to test the field more generally (under the W walk category), or repeatedly test a specific sample site over time (using the GPS feature to find the same sample location to place the quadrat).
  2. From within a quadrat collect about a handful of forage, by tearing. Pretend you are a cow or sheep munching away on the plants.
  3. Squish the handful into the garlic crusher.
  4. Hold refractometer in one hand, flip back the plastic flap to expose the glass face.
  5. Hold filled garlic crusher in the other and squeeze ‘juice’ from picked grasses onto the glass face of the refractometer.
  6. You need just one drop of ‘juice’ on the glass screen. Then drop the refractometer’s plastic flap on top of the drop so it smears across the screen.
  7. Hold the refractometer up to the sky (about 15degs) and look into the lens.
  8. There will be an area/line on the scale where it changes from light blue below to dark blue above.
  9. Record the number on the scale and if the line is fuzzy or not in the app.
  10. Clean and dry the glass screen with your water ready for the next test
  11. Remove residues from garlic crusher.

What to record in the Soilmentor app:

  • Number 0-30 on ‘Brix’ scale of refractometer and
  • Yes/No for whether the line is fuzzy or not.




Measuring brix with Tim Williams at English Farm: