Disclosed herein are a method for disposing of organic waste materials using microorganisms; methods for accelerating the growth of plants, for destroying or repelling insect pests, for improving the soil, of deodorization and for improving water quality, using the waste materials processed by the disposal method; and compositions for use in these methods. The microbiological method for disposing of an organic waste material comprises the step of bringing (i) an organic waste material into contact with (ii) at least 5 species of microorganisms, each being selected from each of 5 groups consisting of actinomycetes, phototrophic bacteria, lactic acid bacteria, mold fungi and yeast, the microorganisms (a) being acid-fast, (b) capable of producing lactic acid, (c) producing no butyric acid, (d) being non-pathogenic and (e) having an antagonistic value of 50 or more.
