Fig. 6

Kyoto encyclopedia of genes and genomes (KEGG) pathways map of the identified differential metabolites between the NT vs. DT (A), SS vs. DT (B) and SS vs. NT (C). The larger the dot, the greater the impact. Color is related to P value, and the darker the color, the smaller the P value. NT: no tillage; SS: subsoiling; DT: deep tillage.