In order to investigate the effects of citrate soluble potash and potassium fertilizers on soil improvement and the growth of flue - cured tobacco,potted tobacco was employed to research the influence of citrate soluble potassium fertilizer with different proportions on soil physical and chemical properties (soil bulk density,soil porosity,soil potassium content),soil microbes (fungi,bacteria,and actinomycetes) activity and root growth (root biomass,root configuration parameters,root activity) under drought stress. The results showed that applying citrate soluble potassium fertilizer can reduc...