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.