Under what moisture content in soil does bacteria activity cease?

Bacterial activity in soil is significantly influenced by moisture content, as water is essential for biochemical processes. Below a moisture content of approximately 14-16%, the soil becomes too dry to support the metabolic activities of bacteria. At this level, the availability of water decreases, rendering the soil a less hospitable environment for microbial life, which relies on moisture for nutrient transport and cellular functions.

When soil moisture falls below this threshold, the bacteria are unable to access the water needed for their processes, leading to a reduction in their activity or even a complete cessation. This phenomenon is crucial for understanding soil health and microbial ecology, especially in context with soil compaction or drought conditions that can affect agricultural and environmental systems.