Disclosed are two Bacillus strains, namely Bacillus sp. AT-332 containing 16S rDNA represented by SEQ ID NO: 2 and Bacillus sp. AT-79 containing 16S rDNA represented by SEQ ID NO: 3, wherein SEQ ID NOs: 2 and 3 are disclosed in the specification. Also disclosed is a method for cultivating plants by treating the plants with one of the above mentioned strains.