Brix Testing Pasture: Refractometer Sampling Done Right

Farm Learning with Tim Thompson | 3 March 2026 | Back to All Videos
Want to measure pasture quality in real time — not guess it from colour and growth?
In this video, Ben Christensen (GreenMate Agriculture) shows how to do BRIX testing properly, and why most people get misleading results.

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BRIX testing gives you a fast snapshot of plant sap sugars and an extra clue many miss: the definition/fuzziness of the line, which can indicate more complex dissolved solids and feed value. We cover how to sample pasture without bias, how to zone a paddock, how many grabs you actually need, and the simple calibration step that protects your data.

This is practical, farmer-to-farmer measurement that helps you track:

pasture nutrition changes through the season

paddock-to-paddock differences

the impact of grazing decisions and fertility programs

stress effects (heat, drought, cloud cover, time of day)

You’ll see the full process using accessible gear: a cheap refractometer, water for calibration, and a basic garlic press to extract sap — plus the common traps that ruin readings (dew, gateways, troughs, “fertility patches”, and sampling at the wrong time).

For more context on why this method matters and how it fits into real farm decision-making, I’ve also written about BRIX testing on my site.

Chapters are below so you can jump straight to calibration, paddock zoning, sampling, or reading the line.

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Featured guest: Ben Christensen — GreenMate Agriculture https://greenmate.com.au/

Tools shown: BRIX refractometer, calibration water, eyedropper, garlic press
Systems covered: paddock zoning, pasture monitoring, seasonal benchmarking

#RegenerativeAgriculture #PastureManagement #BrixTesting #SoilHealth #Grazing

00:00 Why BRIX matters (beyond “green grass”)
00:13 What a good agronomist should give you: measurement
00:48 What BRIX testing actually tells a farmer
01:31 Sugar vs feed quality you can’t see
02:04 How to read the number AND the line definition
03:10 The big trap: high BRIX from simple sugar
04:20 Where to sample: avoid the bias zones
05:15 Paddock zoning demo: how many tests in one paddock
06:24 Calibration: when and why it matters
07:54 Step-by-step refractometer calibration
09:40 How many samples per zone (minimum vs ideal)
11:12 What to pick (and what to avoid)
12:01 Packing the garlic press: the method that works
15:32 Interpreting a low reading in tough conditions
16:24 Time of day, dew, cloud: what shifts results
18:00 Using BRIX to track trials and management changes
20:10 Wrap-up + GreenMate link and what’s next

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on-farm trials pasture

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