Abstract: A pot experiment was conducted to study the effects of Sophora flavescens decayed products on the growth of eggplant (Solanum melongena) and the microbial populations and enzyme activities in its rhizosphere soil under the stress of vanillin and cinnamic acid. Compared with the control, the addition of S. flavescens decayed products promoted the plant height and stem diameter of S. melongena, and increased the amounts of microbial populations, especially of bacteria and actinomycetes, in rhizosphere soil. With the increasing stress of vanillin and cinnamic acid, the amounts of bacteria and actinomycetes in rhizosphere soil decreased after an initial increase, while that of fungi was in reverse. The addition of S. flavescens decayed products also increased the activities of catalase, polyphenol oxidase, and urease in rhizosphere soil, which had the same variation trend as the amounts of bacteria and actinomycetes with the increasing stress of test phenolic acids.

Key words: Rhodiola sachalinensis, Biomass, Salidroside content, Seasonal variation, Shading and red film treatment