The study looked at how Brassica juncea plants absorb heavy metals like Cd and Ni when treated with EDTA. They found that the plants treated with EDTA had higher concentrations of Cd and Ni compared to untreated plants. By analyzing different growth periods, they discovered that the best time to harvest Brassica juncea for maximum metal absorption was at 49 days. This means that EDTA can help improve the transfer of heavy metals in these plants.