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Soil Microbe & Root Alliances

  • Writer: Shanti
    Shanti
  • 6 days ago
  • 2 min read

The narrow zone around roots is called the rhizosphere. Roots release compounds and alter water and nutrients there, while bacteria, archaea, fungi and other organisms can affect nutrient cycling, growth, disease and stress responses.

Photorealistic soil cross-section with green plants above dark, crumbly garden soil containing fine roots, pale root nodules, fungal threads, earthworm, soil aggregates and visible pores, with circular magnified views of microscopic soil features.
A scientific cutaway of healthy living garden soil showing plant roots, visible root nodules, stable soil aggregates, pore spaces, fungal threads and an earthworm, with magnified details highlighting the complex biological and physical structure below ground.

What This Index Covers

This index covers the rhizosphere, root exudates, nitrogen-fixing nodules, nutrient-mobilising organisms, disease-suppressive communities, endophytes, pathogens, soil food webs, research methods and microbial products. It separates general soil biodiversity from evidence for a specific organism, crop or claimed benefit.


Browse Resources

Browse the resource areas currently organised under this index. Links can be added as reviewed articles and records are published.


Rhizosphere processes - Explore how roots change their immediate soil environment.

Nutrient alliances - Review nitrogen fixation, phosphorus mobilisation and other measured exchanges.

Plant health - Connect beneficial, neutral and harmful organisms with host and soil conditions.

Soil food webs - Follow interactions among microbes, protists, nematodes, arthropods and roots.

Management effects - Explore tillage, compaction, organic inputs, fertiliser, pesticides, water and disturbance.

Evidence methods - Understand culture, microscopy, sequencing, enzyme tests and controlled trials.

 

Read First

Before using these resources for identification, growing, harvesting, conservation, community work or other practical decisions, read:

Soil Microbiome Claims Need Species, Method and Context

A Laboratory Test Is Not the Same as Field Performance

Protect Soil Habitat Before Buying Microbial Products

 

Coverage and Evidence

Microbial communities are extremely diverse and can change over short distances and time. Detecting DNA does not prove that an organism is alive, active or causing an observed effect. A benefit found in one host, soil or controlled trial may not transfer to another site. Do not brew or apply unverified microbial products where human, animal or plant pathogens could be introduced. Start with soil protection and measured site needs.


The Earth Resource Map and Learn library are being built progressively. Indexed means that a topic or resource can be connected to its identity, source and broad context; it does not mean that every claim has been verified or localised. Evidence is assessed claim by claim. Where information is missing, uncertain, restricted or location-dependent, that limitation should remain visible.


Last Reviewed

20 August 2026

This date records review of this index-page copy and its resource structure. Individual articles, records, laws, project details and evidence may have different publication and review dates.

 

Continue Exploring

 

References

Bissett, A., Fitzgerald, A., Meintjes, T., Mele, P. M., Reith, F., Dennis, P. G., et al. (2019). Soil biodiversity and biogeochemical function in managed ecosystems. Soil Research, 58(1), 1-20. https://www.publish.csiro.au/sr/fulltext/sr19067


La, S., Han, J., Li, H., et al. (2024). Protective role of native root-associated bacterial communities against root-knot nematodes. Nature Communications. https://www.nature.com/articles/s41467-024-51073-7


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