TeraGanix EM-1 Microbial Inoculant, 55 GallonRevitalize Your Soil with EM 1 Effective Microorganisms. EM 1 soil conditioner concentrate, is an organic soil amendment containing a carefully curated blend of 83 beneficial microbes known as Effective Microorganisms or EM. These beneficial microbes help improve soil quality, fertility, pest and disease resistance and boost plant growth and yields. When applied to the roots, it establishes a thriving population of beneficial microbes in the