Manure jumpstarts dead nitrogen cycling in mining waste soil
Luo Y, Lin Y, Chen Z, Lin J, Owens G
Soil Health
If you've ever wondered whether a trashed patch of land can come back to life, this shows that the right organic input can reboot the invisible microbial machinery that makes soil fertile again, the same machinery working under your own garden beds right now.
When companies mine rare earth elements, they often leave behind soil so loaded with ammonium that almost nothing can grow in it, and the microbes that normally recycle nitrogen go quiet. Scientists found that adding manure to this soil woke those microbes back up, slashing the excess ammonium by nearly 90% and triggering a cascade of enzyme activity and gene expression that turns raw nitrogen into forms plants can actually use. It's basically proof that the right compost-like amendment can resuscitate a biologically dead soil from the inside out.
Key Findings
Manure amendment reduced extractable ammonium nitrogen by 88.3% from initial levels while oxidized inorganic nitrogen accumulated.
Net nitrogen mineralization peaked early at 15.45 mg N per kg per day, accompanied by peptide cleavage and amino sugar turnover.
Ammonia-oxidizing genes (amoABC, hao) were enriched, with archaeal and bacterial amoA genes increasing 2.8 to 15-fold under manure treatment.
chevron_right Technical Summary
Mining leaves behind rare earth tailings soil choked with excess ammonium, which stalls plant growth and risks nitrogen pollution. Adding manure to this damaged soil kicked nitrogen cycling back into gear, cutting ammonium levels by 88% and reviving the soil microbes needed to make nitrogen usable for plants again.
Abstract Preview
Original paper
Bioresource amendment promotes early mineralization and nitrification recovery in ammonium-rich rare earth tailings.
Rare earth tailings soil retains high residual NH4+-N after in-situ leaching with ammonium sulfate, creating coupled risks of nitrogen loss and poor revegetation. The substrate and microbial pathwa...
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