An experiment was carried out in south of Anhui province to study soil microbe categories and relative numbers of four kinds soil system(bottomland,alluvium,paddy clay and alluvion sand)in tobacco life cycle.The main results are as followno matter in rooted or non-rooted soil,the bacteria,fungi and actinomycetes are main categories which gross numbers are more than 95% in all soil microbe mounts.During the flue-cured tobacco life cycle,the non-rooted microbe gross number was less than the rooted's,moreover ...