This study deals with an efficiency of a low dose of citric acid soil application on phytoextraction of uranium. Willow (Salix
spp.) and sunflower (Helianthus annus L.) were tested in this experiment with contaminated soil. The enhancing of uranium bioaccumulation was confirmed, but in
contrast to previous studies, the highest quantity of uranium was accumulated in leaves. After 5 weeks of citric acid treatment,
willow was more efficient in the uptake and translocation of uranium than sunflower. The transfer coefficient calculated for
leaves increased from 0.033 (control) to 0.74, or 0.56 after five doses of 5 mmol of citric acid per 1 kg of soil for willow
or sunflower, respectively. The uptake characterized by the total U content achieved 88 and 108 mg kg−1 in relation to the above ground parts of sunflower and willow, respectively. Even though both plants accumulated U in their
above ground parts in significant rate, they employed diverse ways to achieve it. At the end of the treatment, the physiological
condition of the plants enabled us to continue this method.