Abstract: The effects of different concentrations of microbial inoculants on the growth, quality and soil properties of the‘Qixing’ fruit radish were studied by field experiment, in order to provide a reference for the most suitable amount of microbial inoculants for the cultivation of radish in greenhouses. The results showed that plant height, stem diameter, leaf area and leaf color were affected in different degrees, but the difference was not significant. The total output of radish under T4 treatment was the highest, and the economic benefit reached 230 900 yuan/hm². For the quality of radish in facilities, the vitamin C content of T3 treatment was the highest, which was increased by 17.9% and 11.0% respectively compared with T1 treatment without inoculant and T7 treatment, followed by T5 treatment. The total acidity of T6 treatment was the lowest, and the sugar-acid ratio was the highest（8.65）, which was significantly increased by 19.24% compared with T1 treatment without inoculant, but had no significant difference compared with T7 treatment. The reduction of nitrate content was most significant in T2 treatment. In rhizosphere soil, urease activity was the highest in T3 treatment, followed by T5 treatment, alkaline phosphatase activity was the highest in T1 treatment, followed by T3 treatment. In the non-rhizosphere soil, the activities of urease and alkaline phosphatase in T4 treatment decreased the most. In the surface soil, the residual content of available phosphorus was the lowest in T3 treatment, followed by T4 treatment, the residual content of nitrate was the lowest in T2, T3 and T4 treatment, and the contents of organic matter and available potassium were the highest in T5 treatment. The results showed that the application of appropriate concentration of microbial agents could promote the growth of radish, improve the yield and quality of radish, improve the soil properties of facilities, and reduce environmental pollution. Overall, T4 treatment（360 kg/hm²）had the best effect on the growth and soil properties of facilities radish, followed by T3 treatment（180 kg/hm²）.

Key words: microbial agent, fruit radish, production, quality, soil characteristics