title: ITS_HHCN1a
design: ITS-seq, In the HHCN group, urea (CO(NH)) was applied. Salix matsudana was planted in heavy - metal - contaminated soil, and CO(NH) was applied at a concentration of 300 kghmyear to observe the impact of ultra - high - level urea on the phytoremediation of heavy - metal - contaminated soil. The maintenance conditions were the same as those of other groups.