Study on the variation of microflora and nematode in the rhizosphere of replanted strawberry with different soil treatments

The population densities and varieties of fungi,bacteria and actinomycetes at three stages in the rhizosphere soil of replanted strawberry,treated with solar heating,Yuanmei medicament and methyl bromide,were studied to prove the ecological safety and effect of Yuanmei medicament.In the rhizosphere of control or replanted strawberry,the population of fungi and actinomycetes increased,and the population of bacteria increased earlier and diminished later from the stage of young fruit to post harvest.After different soil treatments,rhizosphere bacteria accumulated,whereas the fungi and actinomycetes reduced compared to that of the control.So the soil have changed from fungi style to bacteria style.After soil treatment with Yuanmei medicament the fungi population in soil was only 1/10 that of control,and there were no differences from that of the other two treatments.Treatments with solar heating,Yuanmei medicament and methyl bromide reduced the population of actinomycetes by 85.9%,84.0% and 71.1%,respectively,whereas the numbers of bacteria were two or three times more than that of control in the heavy seed period.The number of nematodes detected in soil through washing analysis was not directly related to the soil treatments.