This invention relates to the field of microbial technology. To address the problem that the current growing environment for onions is mostly
saline-alkali, and there is no effective compound
microbial agent for controlling onion basal rot under such conditions, this invention discloses a compound
microbial agent, its preparation method, and its application. This compound
microbial agent is composed of *
Trichoderma harzianum* M3, *Bacillus bereaves* MP6, *Bacillus halophilus* SYP202, *
Staphylococcus squirrelii* LAB2, and *
Microbacterium acetylaceum* LAB3-2. Among them, *
Trichoderma harzianum* M3, *
Staphylococcus squirrelii* LAB2, and *
Microbacterium acetylaceum* LAB3-2 are screened from onion
rhizosphere soil and combined with the superior growth-promoting strains *Bacillus bereaves* MP6 and *Bacillus halophilus* SYP202 from a microbial strain resource
bank to form a compound microbial agent. This compound microbial agent can achieve
disease prevention and
growth promotion effects, as well as soil improvement effects. It aims to provide
technical support for the green control of onion basal rot and the improvement of onion yield and varieties.