The SOC and TN contents showed statistically significant
differences among the five treatments (Fig.3). We observed that the
application of fertilizers (especially OM and NPK fertilizers) had
remarkably improved SOC and TN values compared with the
CK. Specifically, the OM treatment resulted in the highest SOC
and TN concentrations (16.93 and 1.54 g?kg21, respectively),
which was 72.5%. and 51.2%1 higher than that of CK. The SOC
and TN in NPK treatment were significantly higher than CK,
reaching 11.97 and 1.20 g?kg21, respectively. While in SR and
GM treatment, the SOC was remarkably higher than CK,
reaching 10.94 and 10.64 g?kg21 respectively, but significant
differences in TN contents between GM and CK were not
observed.