Rhizosheath score

Rhizosheaths are coatings of soil particles that cling to plant roots, making roots brown instead of white. They are a sign of biological/microbial activity in the rhizosphere (root zone). Soil particles are bound to the roots by biotic glues, secreted by microorganisms. This is aggregation in action and therefore indicates the formation of good soil structure.

Rhizosheath development helps plants to cope with water stress, nitrogen and phosphorus deficiencies, and soil acidity. Biology and exudates around rhizosheath can buffer plants up to a pH of 2 units. This zone also provides a buffer against high Al and Na.

N.B. Some species do not form rhizosheaths, such as cultivars in the brassica, allium & asparagus family.

You can do this test at the same time as the spade tests / VESS test.

What to record

Record rhizosheath score (0-2)

Make notes: Anything interesting you’ve noticed!

Photos

Equipment

A smartphone (with Sectormentor downloaded)

Spade

How to do the test

1. Head to the chosen sample area, and dig out a section of soil as big as your spade. (can be done at the same time as VESS or other spade tests)

2. Gently break soil away from roots and shake gently so loose soil breaks away.

3. Observe if there is any soil that seems attached to the roots, and score as follows: 0 = roots white, no soil covering, 1 = some roots partly covered, 2 = many / most roots coated with soil.

4. Done! Remember to ‘Sync’ your app when you’ve finished and take a photo for future reference.

Resources

https://www.youtube.com/watch?v=ZdbdrAHBRWU&feature=youtu.be