Weed-based charcoal and bacteria team up to clean toxic soil
Rehman H, Butt TA, Khan AHA, Rehman Z, Al-Naghi AAA, Alshammari OG, Mirza CR, Boukendakdji M, Iqbal M.
Phytoremediation
If you garden near old industrial land, roadsides, or anywhere soil might carry heavy metals, this combination offers a low-cost way to grow healthier plants while locking those metals out of your food and out of reach of your hands in the dirt.
Scientists burned a troublesome invasive weed called Parthenium into charcoal (biochar) and paired it with a metal-tolerant soil bacterium, then applied both to corn growing in metal-contaminated soil. The combo helped the corn grow bigger and healthier while trapping toxic metals in the soil instead of letting the plant absorb them, cutting metal uptake by 40 to 65 percent. A computer model even predicted which factors mattered most, giving researchers a roadmap for cleaning up polluted farmland using cheap, plant-based materials.
Key Findings
Combined biochar and bacteria treatment boosted corn biomass and root/shoot length by 56-78% and chlorophyll content by 42-68%
Metal uptake dropped 40-65%, with bioaccumulation down 40% and translocation factor down 60%, while soil metal fractions fell 30-50%
Machine learning models accurately predicted metal uptake outcomes, with support vector regression reaching R² = 0.97
chevron_right Technical Summary
Mixing charcoal made from the invasive weed Parthenium with a helpful soil bacterium cut toxic metal levels in corn plants by up to 65%, while boosting growth and reducing stress, offering a cheap way to grow safer crops on polluted land.
Abstract Preview
Original paper
Application of Parthenium biochar and Serratia marcescens reduced metal toxicity and uptake in Zea mays: An assessment via experimental and predictive modelling.
Biochar and metal-resistant bacteria are increasingly used to stabilize toxic metals in contaminated soils. Parthenium biochar and Serratia marcescens were applied in combination to assess their im...
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Parthenium is a genus of North American annuals, biennials, perennials, subshrubs, and shrubs in the tribe Heliantheae within the family Asteraceae and subfamily Asteroideae.