The invention belongs to microbial
fermentation, and particularly relates to a preparation method of a
probiotic inoculum for preventing replant
disease of
greenhouse cucumbers. The preparation method comprises a
fermentation step: inoculating a
probiotic inoculum producing strain into a sterile culture medium containing a
carbon source, a
nitrogen source, inorganic salt and water; carrying out aerobic
fermentation under the conditions that the temperature is 30-37 DEG C and the pH value is 7.2-7.6 in the fermentation process, wherein the producing strain is a mixture of
Bacillus subtilis,
Bacillus licheniformis,
Trichosporon behrendii,
Paecilomyces lilacinus,
Streptomyces microflavus, Bacillus polymyxa and
Metarhizium anisopliae of the same
mass; and adsorbing the final fermentation product, and immobilizing on grass carbon to obtain the
probiotic inoculum. The preparation method solves the defects of replant
disease,
root rot,
blight,
nematode disease and the like in the existing
greenhouse vegetable-cucumber planting technology, has the advantages of low production cost, short fermentation period and high
flora density, and can effectively prevent
seedling death,
seedling yellowing,
blight, mosaic disease,
root rot and other ecological symptoms of soil. Meanwhile, the preparation method can promote the growth of roots, loosen the soil, strengthen the seedlings and degrade the residual pesticides and fertilizers, and has an effect of obviously restoring the soil
ecosystem. By using the preparation method, the yield of
greenhouse cucumbers can be increased by 15-20% in one season.