How does it improve soil structure and why is that good?
Microbes create pore spaces in soil through their ability to stick fine particles together, aggregate larger clumps with fungal branches and tunnel through the aggregates. As fine structure builds, larger organisms can inhabit the soil, creating even more pore space. This allows more oxygen to enter the soil so even more biological activity can occur. It also allows the soil to act like a sponge and soak up rain water, storing it for the plants to use and preventing erosion. Soil with good structure is easier for plants to root into.