Is a tiny single-celled organism that is the foundation of the soil food web next to fungi. It acts as a fertilizer bag in the soil by immobilizing nutrients until it dies or is eaten and likes to feed on rock and dead green plant material. If it is a beneficial bacteria, it uses its mucilaginous glues to bind the soil to create micro-aggregates or make compost tea thicker and able to coat plant foliage. In a balanced soil, there are 75,000 species of bacteria per gram of soil, and if conditions are right, they reproduce every 20 minutes. There are some bacteria that can withstand very cold or hot temperatures, however, the ones that we would want to cultivate and diversify in the soils prefer temperatures that are between 32-165F. Bacteria comes in three general shapes: spherical, rods, and spirals.
The spherical and rod-shaped bacteria resides in all soils at various ratios and is more beneficial if there is a diversity of their presence in the soil.
Spirillum is a spiral shaped bacteria that is pathogenic to humans and plants, so be careful if you come across it under microscopes.