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Gene copy number per gram dry soil over time for the 16S rRNA gene and nitrogen-fixing gene (nifH) present in two types of soil fumigated with Dazomet (DZ) or unfumigated (CK). Error bars represent standard errors of the means (n = 3). Statistically significant differences between the control and fumigation treatments at a specific time points are shown by asterisks according to the level of significance (∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001).
