Loading…
Microbiologist.in
Pharma QC microbiology, in your pocket
CFU per gram of dry soil from a plate count and moisture content.
Note
Count = 56 × 10⁵ / 0.1 mL = 5.60 × 10^7 CFU per g or mL. Corrected for 20 % moisture: 7.00 × 10^7 CFU per g dry soil.
Reference: Serial dilution plate count corrected for soil moisture. Always follow your approved SOP and current pharmacopoeia.
CFU/g dry soil = colonies × 10ⁿ / volume plated / (1 − moisture fraction)
56 colonies at 10⁻⁵, 0.1 mL, 20 % moisture → 7.0 × 10⁷ CFU/g
Plate counts recover only culturable organisms, a small fraction of soil microbes.