Assessment of yield of metagenomic DNA obtained by methods M1 to M6 for different soils.

DNA concentration (μg/mL) was quantified in a spectrophotometer (A260 nm).
Yield in μg per gram of soil = concentration of DNA (μg/μL). Volume used to suspend DNA (μL) /weight of soil (g)
P values were generated by Graph Pad Prism 5.0 software using paired T-test analysis.
P value < 0.05 is considered to be statistically significant. DNA extraction methods performing worse at a statistically significant level as compared with the best performing method M6 are indicated by asterisks
**** indicates P < 0.0001
*** indicates P < 0.001
** indicates P < 0.01
* indicates P < 0.05
ns indicates P > 0.05 which is statistically non-significant.
Assessment of yield of metagenomic DNA obtained by methods M1 to M6 for different soils.