The effect of the level of fertiliser compounds in the soil on their concentration in drainage runoffs was investigated in an object situated in the Central Sudeten. The basic fertiliser compounds – NPK (available to plants) – were mostly accumulated in the upper layer of the soil profile. The soils under study contained a large amount of nitrogen and available phosphorus but a small proportion of available potassium. The drainage waters from the object had a high concentration of phosphorus, an average concentration of nitrogen and calcium, and low levels of potassium and sodium. An analysis of the results indicates that an increase in the fertiliser compound content of the top layer of soil does not necessarily lead to an increased concentration of those elements in drainage runoffs. In fact, the results suggest that the reverse might be true.

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