If a plant has a large quantity of soil clinging to its roots, where the roots appear brown and not white, this soil coating is called a rhizosheath.
Why do we love them so much? They are an indicator of life in the soil: of biological and microbial activity in the rhizosphere, which is also known as the root zone.
Micro-organisms feed on root exudates and secrete binding agents which hold soil particles together around the roots in an aggregated structure, which indicates good soil health.
“A simple way to find out what healthy soil looks like in your fields is to pull up some weeds! Don’t be surprised if you find rhizosheaths on these roots; weeds are often the healthiest plants in your soil.” – Niels Corfield, Soil Health Advisor
Watch the video below to find out how to assess rhizosheaths in your soil:
Fred Price, a regenerative farmer, describes how rhizosheaths indicate good soil health: “Seven years ago I didn’t know roots could look like this (see photo below)! The biological component of our soils mediates the soil-plant interface, increasing availability of nutrients and resilience to biotic and abiotic stress. So a well developed rhizosphere, the zone of plant influence in the soil characterised by root exudates, microorganisms and indicated by a healthy rhizosheath, is a great barometer for a highly functioning soil ecosystem. This vitality reduces the need for synthetic inputs, allowing the biological component to flourish further – this positive feedback cycle underpins any regenerative farming system.”
Soilmentor can be used to monitor the development of rhizosheaths by scoring them on a scale of 1-3 in the app and observing how these scores change over time.
We plan to develop this scale to be more nuanced, so if you’ve been observing rhizosheaths in your soils we’d love to hear from you about your experience – email@example.com.