The dynamics of potassium in the soil was investigated in long-term small-plot field trials at the three stations (Tab. 1), where was used five variants of fertilisation (Tab. 2). The aim of experiment was to determine the effect of mineral fertilisers and organic manures on K balances and content its forms in soil. The level of the potassium in three forms: water-soluble K, available K and mobile K reserve were determined. The water-soluble K was most influenced by the graded dosages of fertilisers. The content of water-soluble K and available K increased about two times compared to first variant (no fertilised), 100.6% (Tab. 3) and 96.6% respectively (Tab, 4). The level of mobile K reserve was not influenced by the fertilisation (Tab 5).
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