How to do the test
1. Locate your chosen sample site – this may be mapped with the GPS function of Sectormentor.
2. Dig out a small section of soil, no wider than your spade or do with other spade tests (20cm x 20cm).
3. Gently break or wash away soil from roots of legumes.
4. Observe if there are any nodules on the roots. If so, select four of the largest nodules to cut to check the colour.
5. Record a score on the scale above in the Sectormentor app.