Abstract: The characteristic of K-fixation on farming brown soil & meadow soil in Shenyang area and the effect of organic manure application on K-fixation was studied with constant moisture at water holding capacity and wetting-drying incubation experiments.In all studies,483.72 mg K·kg^-1 soil was applied before monitoring of K fixation.Results indicated that the process of fixation to extra-K was rapid in both of the two soils,and the fixation reaction reached equilibrium within 1day on field capacity incubation. The K-fixation capacity can be increased by 26.80%～33.27% with wetting-drying incubation compared to constant field capacity incubation.The power of K-fixation can be decreased by organic manure application with both kinds of incubation.The capacity of K-fixation decreased 25.71% and 36.62% on brown soil and meadow soil respectively after 15 days of wetting-drying incubation with 6% organic manure applied.

Key words: Cucumber, Rhizosphere, Pathogen, Antagonistic bacteria, Population number