Wide Spectrum Inhibitory Effect Study of Two Botanical Antimicrobials to Soil and Air Microbes

Two botanical antimicrobials: matrine and pyrethrin were used to study their wide spectrum inhibitory effect on microbes from air and soil, to compare their properties as effective inoculant additive. The result indicates that both the two antimicrobials have inhibited microbe number significantly as the increase of concentration contents, but stimulated microbe diameter. Matrine and pyrethrin have shown their superiority in inhibiting actinomycetes (completely inhibition concentration: 400 mg L-1 for air-oriented and 700mg L-1 for soil-oriented) and mould (completely inhibition concentration: 1000 mg L-1 for air-oriented and 1500mg L-1 for soil-oriented) growth, respectively, and could be chosen to conduct inhibition based on the specific situation of microbial inoculants.