1. Roots Have Partners
Most land plants, including grapevines, form partnerships with mycorrhizal fungi. The fungus grows a network of fine threads, called hyphae, through the soil, far beyond the reach of the roots. The plant supplies sugars, and the fungus helps it take up nutrients, especially phosphorus, and can support water uptake and soil structure.
2. What the Network Does
The fungal network increases the volume of soil a vine can draw on, and it can reach small pores where nutrients are held tightly. Some fungi help bind soil particles into stable crumbs, which improves drainage and aeration. The size of these benefits depends on soil type, climate and vine variety.
Vineyard practices and their likely effect on mycorrhizal partners (qualitative)
| Management practice | Likely effect on the network | Common adjustment |
|---|---|---|
| Intensive tillage | Can break the hyphal network | Reduce tillage where practical |
| Certain fungicides | Can reduce fungal activity | Use only when needed and follow the label |
| Cover crops | Can support a more varied soil community | Choose species suited to the site |
| Heavy soluble fertiliser | Can reduce the vine's reliance on its fungal partners | Match inputs to soil tests |
3. Managing the Soil Community
Growers who want to support these partners often reduce tillage, keep plant cover on the soil for longer, and use soil tests to avoid over-applying phosphorus. Organic matter feeds the fungal community. The aim is soil that supports the vine naturally, rather than one that depends on heavy inputs each season.
4. Limits of the Evidence
Research on mycorrhizal benefits in vineyards is active but uneven. Some effects are well documented, while others depend on the site and the grower. Results from one region should be tested before they are assumed to apply elsewhere.