Dynamic change of the microbial flora of processed tomato rhizosphere under the conditions of continuous cropping.

[Objective]Dynamic change of the microbial flora of processed tomato(Lycopersicon esculentum Miller) rhizosphere under the conditions of continuous cropping were studied in order to lay the theoretical basis for constituting the mode of processed tomato rational rotate and conquering the obstacle under the conditions of continuous cropping.[Method]The Method of pot experiment was used in this experiment,digging the rhizosphere soil different years of continuous cropping on the anthesis,then taking count of microbe by the method of MPN.[Result]Bacteria was 97.6% in processed tomato rhizosphere,actinomycete was 2.3%,and fungi was the least,only 0.4%.Bacteria decreased with continuous cropping year increasing,but actinomycete and fungi increased.Along with the continuous cropping year increasing,nitrobacteria,aerobic azotobacter,aerobic cellulose decomposing bacteria and anaerobic cellulose decomposing bacteria decreased,while antisulphate was increased in the third year of continuous cropping and the sequence of their amount on soil was nitrifierantisulphate reducerazotobactercellulose decomposing bacteria.[Conclusion]Rhizosphere soil shifted from bacteria type to fungi type significientyly after continuous cropping,which result in reducing of soil fertility,and the sequence of the beneficial bacteria were decreased and the harmful bacteria were increased having negative effect on translation of soil nutriention.