EM stands for Effective Microorganisms and is a mixture of microorganisms. Effective Microorganisms contain a mixture of photosynthetic bacteria (rhodopseudomonas palustris), lactic acid bacteria (lactobacillus casei, kactobacillus plantarum) and wheat (saccharomyces cerevisiae). Effective Microorganisms influence the microbial environment in a way that the constructive microorganisms become dominant. This creates an environment, in which the microorganisms play a positive role in plant growth, plant quality and soil fertility by using fermentation. Fermentative decomposition is stimulated and decomposition disappears, so that less energy is lost. Soil in which constructive microorganisms dominate can produce optimal productivity levels, suppress illnesses and produce high-quality products.

It has already been scientifically proven that there is a range of anaerobic microorganisms that can survive in environments that significantly exceed 1000 °C. Effective Microorganisms also contain photosynthetic bacteria that make their habitats in the world’s most inhospitable environments (volcanoes, black smoke).