Soil micro-organisms are most active at

Soil micro-organisms are most active at 34° - 36°C.
Soil microbial activity that reflects the microbiological processes of soil microorganisms is the potential indicator of soil quality, as plants rely on soil microorganisms to mineralize organic nutrients for growth and development.
Most soil microbes grow best at temperatures between 34 - 36° Celsius and their growth rates increase with increasing temperature up to a point.