Researchers studied how adding organic materials to soil contaminated with heavy metals affects the uptake of these metals by tobacco plants. They used compost and vermicompost in different amounts and found that higher levels of these organic materials reduced the concentration of heavy metals in the leaves of the tobacco plants. The plants were able to take up more essential nutrients like potassium, calcium, and magnesium when treated with compost and vermicompost. This suggests that using enhanced tobacco plants with organic amendments could help in cleaning up soil contaminated with heavy metals through a process called phytoremediation.