| Environmental factor |
Optimum conditions |
Conditions required for microbial activity |
| Available soil moisture |
25-28% water holding capacity |
25-28% water holding capacity |
| Oxygen |
>0.2 mg/ L DO, > 10 % air filled pore space for aerobic degradation |
Aerobic , minimum air filled pore space of 10% |
| Redox potential |
Eh > 50 mill volts |
|
| Nutrients |
C:N:P= 120:10:1 molar ratio |
N and P for microbial growth |
| pH |
6.5-8.0 |
5.5 to 8.5 |
| Temperature |
20-30 degree Celsius |
15-45 degree Celsius |
| Contaminants |
Hydrocarbon 5-10 % of dry weight of soil |
Not too toxic |
| Heavy metals |
700ppm |
Total content 2000ppm. |
