When we think about agriculture, we usually focus on what grows aboveground: the golden wheat, the green grasslands, and the tractors in the field. But beneath our feet there is a whole hidden world that is just as important. In only 1 gram of soil, there’s more living organisms than people in the world, and together, these complex communities of bacteria, fungi, protists, nematodes, earthworms, microarthropods, and many others, keep soils functioning and productive.