In the previous article in this series on mycorrhizal fungi, the authors explained how to return mycorrhizal activity to cropland and pasture soils. In this issue they review the impacts of fertilisers and fungicides on mycorrhizae to better understand how to maintain these fungal colonies. When applying a mycorrhizal inoculant at planting, it is important to avoid high levels of phosphorous in the soil proximate to the target seed or roots. Readily available soil phosphorus in excess of approximately 70 parts per million (ppm) can prevent the mycorrhizal spores in an inoculant from breaking dormancy when in near contact with a live root.
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