Foliar metal micronutrients reshape rhizosphere soil multifunctionality by filtering microbial life-history strategies.
Liu Y, Xiong G, Gao L, Li Y, Zhou X
Soil Health
The foliar sprays sold at garden centers for micronutrient deficiencies aren't just feeding your plants — they're quietly reorganizing the soil life beneath them, and not always in your favor.
Scientists sprayed different metals onto the leaves of a medicinal plant and then looked at what happened underground in the root zone. Iron sprays encouraged helpful, efficient bacteria that kept the soil functioning well. Copper and zinc sprays did the opposite — they shifted the soil toward bacteria associated with worse soil health and even more plant pathogens. The takeaway: what you put on your leaves changes who lives in your dirt.
Key Findings
Foliar iron application significantly enhanced rhizosphere soil multifunctionality, including nutrient cycling, while copper and zinc reduced these functions.
Copper and zinc sprays increased the abundance of plant pathogens in the root-zone soil.
The mechanism was microbial: iron promoted efficient, well-connected bacteria (Y-strategists), while copper and zinc enriched larger-genome bacteria negatively associated with soil health (AS-strategists).
chevron_right Technical Summary
Spraying iron, zinc, or copper onto the leaves of medicinal plants doesn't just affect the plant — it ripples down into the soil, reshaping the microscopic communities that govern nutrient cycling and disease risk. Iron sprays boosted beneficial soil bacteria and overall soil health, while copper and zinc sprays did the opposite, encouraging microbes linked to plant disease.
Abstract Preview
Foliar application of metal micronutrients is increasingly adopted in intensive cultivation systems, yet its potential ecological risks to rhizosphere functions remain poorly understood. Here, usin...
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