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Applications of fertilizers alone and in combination with organic manure significantly increased the organic carbon, available nitrogen, phosphorous, potassium, and K fractions, i.e., water soluble-K, exchangeable-K, non-exchangeable-K, lattice-K, and total-K in both surface and subsurface soils and without K input (100% NP &amp; 100% N). Among the various K fractions, lattice K was the dominant K fraction. The highest values of these fractions were found in 100% NPK + 5 t FYM ha −1 . The relative contents of these fractions were in order, lattice-K &gt; non-exchangeable K &gt; exchangeable K &gt; water soluble K, and these were higher in surface than the subsurface soils. Correlation studies revealed significant positive relationship of organic carbon and available N, P, and K with different K fractions in surface and subsurface soils. Furthermore, the minimum depletion of the K rate was recorded in 100% NPK + FYM (−2.25 kg ha −1  yr −1 ) to that of other treatments, while control showed a maximum K depletion rate (−3.86 kg ha −1  yr −1 ). Apparent K balance in soil was the lowest, −61 kg ha −1  yr −1 , in control plot followed by −165 kg ha −1  yr −1  in the treatment of 100% NPK + FYM. Hence, much attention is required for potassium fertilizers to maintain the K status of soil and to prevent K mining.

Potassium Balance under Soybean–wheat Cropping System in a 44 Year Old Long Term Fertilizer Experiment on a Vertisol