Fig. 7. Dynamics of available K in soil layers in the third growing seasons of fertilized (solid lines and filled symbols) and control (dashed lines and empty symbols) treatments and application of sewage sludge compost (SSC, solid lines and filled symbols) and cattle manure compost (CMC, dashed lines and empty symbols) at three rates (3, 6, and 12 kg m^–2 yr^–1). Each point represents the mean of four replicates and the bars represent the SE.