Mapping underground fungal networks in Canadian agriculture

Beneath Canada's agricultural land, where wheat, canola, and grain legumes are grown, lies a hidden infrastructure of microscopic fungal filaments. They interact with plant roots, influencing soil structure, carbon movement, and access to nutrients, particularly immobile phosphorus. Estimates suggest that the total length of hyphae in the upper layers of global soil is staggering, yet scientists do not trace a single continuous network around the planet.

Researchers associated with SPUN use field samples, DNA analysis, environmental data, and predictive modeling to identify patterns in mycorrhizal fungi diversity. The project aims to create a global ecological atlas rather than a detailed map of individual filaments. For Canada's agricultural sector, such mapping will make it possible to measure, track, and protect a poorly understood component of the soil ecosystem.

At the same time, mycorrhizal fungi are not a universal biological fertilizer: the nature of the partnership depends on numerous conditions, and the cost of the symbiosis can drain carbon from the plant without significant agronomic return. Traditional soil tests do not show the state of the fungal community, whereas DNA research combined with climate data and land-use information helps predict zones with unique underground biota and identify regions at risk.

The resulting maps do not provide farmers with an instant assessment of soil health and do not replace standard agronomy, chemical analysis, and local expertise. The strategic value of the work lies in identifying knowledge gaps and protecting underground biodiversity, which often suffers from erosion, climate change, and intensive intervention. Amid such challenges as droughts and degradation of organic matter, a national strategy for soil health conservation is being developed in Canada.

For practical application, scientists recommend focusing on preserving living roots, reducing erosion, applying organic fertilizers, and minimizing unnecessary tillage depending on local conditions. The new maps will help improve the design of field experiments and better understand the role of fungi in the underground carbon cycle, although using fungal networks as a basis for simple carbon credits is still premature.