The paper discusses fluctuations, and their underlying causes, in the magnesium content of
meadow sward from a fertilizer experiment set up on a mountain meadow in 1968. The fertilization
experiment comprised 8 different treatments, with the following modifications: liming,
magnesium and microelement fertilization and a change in the sward use made during the
experiment so as to regenerate the sward and to improve the yielding potential. In the initial
period, magnesium concentrations in the sward were assessed using the ASS technique after dry
mineralization of samples and dissolution of the residue in diluted nitric acid. Later, the ICP
technique was applied, including an internal reference sample for the methods. The cultivation
measures caused variations in magnesium concentrations in the sward, depending on a number
of factors, among which direct fertilization was not the most significant one. For example, the
ambient temperature during the plant growing season strongly influenced the magnesium content,
irrespectively of a cut. There was no effect of rainfall of the magnesium content, although
atmospheric precipitation was able to raise considerably the charge of this element. In the second
cut and under neutral soil pH, higher concentrations of magnesium were noted in the
sward. This could have resulted from either the lower second swath yielding or the optimum
conditions for the uptake of magnesium by the sward that occurred during its growth. The investigation
results failed to provide an unambiguous answer to the question whether magnesium
fertilization affected the concentrations of this element. Nonetheless, in order to maintain the
production of valuable fodder it is essential to return systematically the elements taken up with
plant yield to the soil. In intensively managed meadows, amounts of magnesium removed from
the soil with the harvested biomass can be as high as several kilograms per hectare.
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