Dill plants pull heavy metals from sludge-treated soil, unevenly
Ahmed MT, Alrumman SA, Kumar P, Širić I, El-Khalafy MM
Phytoremediation
If you compost with municipal or industrial sludge products, this study is a reminder that leafy herbs like dill can concentrate cadmium and cobalt in their tissue at nearly four times soil levels, so knowing your soil's pH and organic matter can help you gauge risk before you eat what you grow.
Researchers grew dill in soil mixed with different amounts of treated sewage sludge, a fertilizer-like waste product, and measured how much of nine heavy metals ended up in the roots versus the leafy shoots. Some metals like cadmium and cobalt built up strongly in the plant, cadmium and nickel stuck mostly in the roots, while chromium moved efficiently up into the shoots. The team also found that basic soil traits like pH and organic matter content could predict metal uptake well for some elements, like manganese, but poorly for others, like cadmium, meaning soil testing alone can't fully forecast contamination risk.
Key Findings
Cadmium and cobalt showed the strongest plant accumulation, with bioaccumulation factors near 4.0, meaning tissue concentrations were about four times soil levels.
Chromium had the highest root-to-shoot translocation factor (6.25), moving preferentially into aerial tissue, while cadmium and nickel concentrated more in roots.
Soil pH, electrical conductivity, and organic matter predicted manganese uptake in shoots well (R² up to 0.951) but predicted cadmium uptake poorly (R² = 0.154).
chevron_right Technical Summary
Dill plants grown in sewage sludge-treated soil soak up heavy metals like cadmium and cobalt at high rates, and scientists found soil pH, salinity, and organic matter can predict how much of some (but not all) metals end up in the plant.
Abstract Preview
Original paper
Soil property-driven prediction of heavy metal uptake by Anethum graveolens L. in sewage sludge-amended soils toward sustainable biomass utilization.
The present study aimed to develop predictive models for the evaluation of the uptake of nine heavy metals (HMs) by the shoots and roots of Dill plants (Anethum graveolens L.). Plants were grown in...
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Dill is an annual herb in the celery family Apiaceae. Native to North Africa and West Asia, dill is grown widely in Eurasia, where its leaves and seeds are used as a herb or spice for flavouring food.