T, tillage management; S, straw management; Y, year. F -values and significance level with factors of straw management (df = 1), tillage management (df = 2) and year (df = 7). *p < 0.05, **p < 0.01, ***p < 0.001.
Table 3 The changes in the mean of soil organic carbon stock between 2008 and 2016.