Actual state and development of available phosphorus and potassium on agricultural soils in Slovakia | Aktuálny obsah a vývoj prístupného fosforu a draslíka v poľnohospodárskych pôdach Slovenska
2009
Kobza, J., Výskumný ústav pôdoznalectva a ochrany pôdy, Bratislava (Slovak Republic) | Gáborík, Š., Ústredný kontrolný a skúšobný ústav poľnohospodársky, Bratislava (Slovak Republic)
Actual state and development of available phosphorus and potassium on agricultural soils in Slovakia are evaluated in this contribution. Actual results are based on soil monitoring system in Slovakia and agrochemical testing of agricultural soils, as well. The basic analytical procedures of phosphorus (Egners method) and of potassium (Schachtschabels method) have been used. It was determined that content of available phosphorus on agricultural soils is deficient where the area of arable land with low to sufficient supply of this nutrient includes 2/3 of agricultural land of Slovakia with need of systematic fertilisation. Supply of potassium on agricultural soils is better opposite phosphorus, what is caused by mineralogical composition of soils relatively rich in potassium. On the basis of obtained results of soil monitoring system in Slovakia, the decrease of available potassium on agricultural soils about 20-30% has been indicated since 1993 year.
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