The surface and sub-surface samples from the Permanent Manurial Experiment being conducted at Madurai analysed for various fractions of soil potassium to assess the infiuence of continuous manuring and fertilization over eight year period revealed that continuous organic manuring significantly increased the fixed K, exchangeable K and available K in the surface as well as in sub-surface soils. Among the organics, FYM increased the water soluble K fraction appreciably whereas the fixed K, available K and exchangeable K fractions were significantly more in compost applied plots, Continuous application of green leaf manure did not influence the different fractions of K.
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