Fig. 4
Based on 65 pairs of SOC data, the mean value of SOC effect is 0.078 (Fig. 4), with a 95% CI of 0.0422 - 0.1138, indicating that conservation tillage measures could significantly improve SOC concentration at 0-20cm by an average of 8.1% (4.3% - 12.1%, P < 0.001) compared to CT.