Silicon and humic acid help wheat resist lead contamination
Sohail MK, Ghafoor A, Tahir MA, Munir M, Waheed H
Phytoremediation
If you grow food in soil near old roads, railways, or industrial sites, this points to an affordable soil amendment that can cut how much lead ends up in your harvest.
Lead-contaminated soil is a real problem for farmers and home growers alike, since the metal can build up in crops and eventually in the people who eat them. Researchers found that feeding wheat plants silicon, either from a calcium-based mineral or from burnt rice husks, combined with humic acid, helped the plants grow bigger and healthier while keeping lead trapped in the roots instead of letting it travel up into the grain. The calcium-silicate version worked best, cutting lead levels in the grain nearly in half compared to untreated plants.
Key Findings
Calcium silicate (75 kg/ha) plus humic acid increased plant height by 23.22%, total chlorophyll by 24.16%, and grain yield by 32.20% versus contaminated controls.
The same treatment reduced lead concentrations by 22.39% in roots, 25.19% in shoots, and 46.55% in grains.
Both silicon sources boosted antioxidant enzymes (superoxide dismutase and peroxidase), lowering oxidative stress, with the synthetic calcium silicate source outperforming burnt rice husk.
chevron_right Technical Summary
Adding silicon-based fertilizers along with humic acid to lead-contaminated soil helped wheat plants grow taller, stay greener, and produce nearly a third more grain, while also locking more lead out of the edible parts of the crop.
Abstract Preview
Original paper
Alleviation of lead toxicity and enhancement of wheat (Triticum aestivum L.) yield and antioxidant capacity using silicon and humic acid amendments in contaminated soil.
Lead (Pb) contaminates agricultural soils, endangering human health, plant life, and the global food supply. Several strategies have been explored to mitigate Pb toxicity. Silicon (Si) can be used ...
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