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. 2018 Mar 14;8:4500. doi: 10.1038/s41598-018-22822-8

Figure 4.

Figure 4

Weekly soil temperature (mean ± standard error) for maize residue and soybean residue in 2004 (a), 2005 (b), 2006 (c), and 2007 (d). Data from three tillage systems for each residue type were pooled. Bars in the same period and capped by the same letter indicate the means are not significantly different (P > 0.05) according to Tukey test.