FIGURE 3.
The treatment means of soil microbial marker genes in log10 (copies/μg DNA), including bacterial (Bacteria) and archaeal (Archaea) 16S rRNA, fungal ITS region (Fungi), nifH, archaeal (AOA) and bacterial (AOB) amoA, nirK, nirS, and nosZ-I separated by cover cropping (CC), with their standard errors of the mean as whiskers. The CC treatment levels were bare fallow control (BF) and hairy vetch and cereal rye cover crop mixture (CC).