Size of bacterial genome = 130 kbps to 14 Mbps.
1 gm (1000 mg) soil contains at least 1 billion bacteria.
100 mg soil should have atleast 0.1 billion bacteria.
One bacterium has atleast 130 kbps DNA.
0.1 Billion bacteria will have atleast 130*0.1 =13 billion kbps
