Fig. 2

Boxplots of total DNA concentrations grouped by treatment (n = 19–22 individual extractions per treatment). A and B letters differentiate significantly different groups (Tukey’s test p < 0.05). Medians are indicated by the solid black lines, and the 25 and 75% quartiles are represented by the lower and upper bounds of the box. Outliers are indicated as black circles and represent samples falling outside the 10 and 90% quartiles. PS PowerSoil, PP PowerPlant Pro, PB PowerBiofilm, VG UC Vortex Garnet, PG UC Powerlyzer Glass, VGl UC Vortex Glass