Zymogenic Soils are soils where fermentative microorganisms like lactic acid bacteria, yeast, etc. predominate, a fragrant smell is given off and Aspergillus frequently grows when living organic matter is manured. Fusarium is below 5% with a high capability of forming water-resistant crumbs, the soil expands and becomes soft, and solubility of inorganic nutrients is hastened. Physiologically activated substances such as amino acids, polysaccharides, vitamins, and others in the soil increase, and the growth of crops is hastened. Likewise, methane in paddy fields is restrained from emission.
From: Agricultural Utilization Of Microorganisms For Environmental Conservation. D.r Teruo Higa. Pp 17-18.