In order to clarify the effectiveness of the combined application of different amounts of dazomet and microbial agents in preventing tomato soil borne diseases,a greenhouse plot experiment was conducted using conventional fertilization as a control(CK).The effects of 20 g·m-2 and 40 g·m-2 amounts of dazomet combined with Trichoderma harzianum agent and fertilizer,Paecilomyces lilacinus and bacteria combined agent and fertilizer on tomato rhizosphere soil microorganisms,Meloidogyne,tomato growth,quality,and yield were studied.The results showed that the number of bacteria in the fumigated soil was significantly higher than that of CK,and the difference among fumigated treatments was not significant.Meloidogyne were not found in the fumigation soil,while the number of Meloidogyne in CK was 2170 in 1 kg soil.The incidence rate of tomato plants in the treatments was significantly lower than that in CK,but it was not significant among the four treatments.Secondly,the plant heights of tomato in treatments M20 and T20 fumigated with dazomet at a dosage of 20 g·m-2 were higher than that in treatments M40 and T40 fumigated with dazomet at a dosage of 40 g·m-2.However,no significant difference was observed on the stem diameter among the treatments,indicating that the combination of different dosages and microbial agents has a certain promoting effect on tomato growth and a positive effect on tomato yield.In summary,considering cost saving,efficiency improvement and environmental protection,it is indicated that the application of soil fumigantion with dazomet at the dosage of 20 g·m-2 combined with Trichoderma harzianum agent and fertilizer could control the tomato soil borne diseases effectively and improve the tomato yield and quality.
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