Extended Data Fig. 1: Cumulative CH4 emission over 8 years with different amendment strategies.

Different letters above the bar present the significant differences among treatment for each year. There is no interaction between the year and the treatment. Data are presented as mean values ± SEM to account for variability within the replicates (n = 3). The letters above bars denote significant differences (p < 0.05) between treatments for each year in one-way ANOVA. Post-hoc comparisons were conducted using the LSD test to determine specific group differences.