The pot experiment was set up on soil sampled from topsoil of the podzolic soil of the slightly-loamy-sand grain size composition. The soil was very acid with a low available phosphorus content and a very low content of available forms of magnesium and potassium. Prior to the experiment, half of the soil material was limed with CaCO₃. The other experiment factors included nitrogen (NH₄NO₃) and phosphorus fertilisation (Ca(H₂PO₄)₂ and Ca₃(PO₄)₂). Liming, nitrogen and phosphorus fertilisation increased the contents of available phosphorus and of mineral phosphorus fractions. The fertilisation with superphosphate increased the content of phosphates easily soluble and ferric, while the content of calcium phosphates depended on the fertilisation with rock phosphate meal.

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