Biochar-Amended Soils Increase Arbuscular Mycorrhizal Colonization 2.4x
Warnock D, Lehmann J, Rillig M
Soil Health
If you add biochar to your garden or raised beds, you could more than double the helpful fungi that connect to your plants' roots — meaning healthier plants that need less fertilizer and water.
Biochar is a type of charcoal made from burnt plant material that you can mix into soil. Scientists looked at 89 real-world experiments and found that soils with biochar had 2.4 times more beneficial fungi growing on plant roots compared to soils without it. These fungi act like a supply network for plants, helping them absorb water and nutrients — and biochar's tiny pores give those fungi a safe place to live and spread.
Key Findings
Biochar application increased beneficial fungal root colonization by 2.4x on average across 89 field studies
The effect was strongest in degraded soils (3.1x increase) and weakest in already-fertile soils (1.4x increase)
Biochar's porous physical structure provides protective refugia for fungal hyphae, explaining the mechanism behind the boost
chevron_right Technical Summary
Adding biochar to soil more than doubles the presence of beneficial fungi on plant roots, with the biggest gains in degraded or depleted soils. This large-scale analysis of 89 field studies confirms biochar as a practical tool for restoring soil biology.
Abstract Preview
Meta-analysis of 89 field studies shows biochar application increases AMF root colonization by 2.4x on average. The effect is strongest in degraded soils (3.1x) and weakest in fertile soils (1.4x)....
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