ITS_HCN2a
ITS-seq, In the HCN group, urea (CO(NH)) was applied. Salix matsudana was planted in heavy - metal - contaminated soil, and CO(NH) was applied at a concentration of 200 kghmyear to observe the impact of high - level urea on the phytoremediation of heavy - metal - contaminated soil. The maintenance conditions were consistent with those of other groups.