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The aim of the research was assessment of N, P, K, Ca, Mg content in particular parts of Virginia mallow (Sida hermaphrodita Rusby), that is leaves, stems and roots, under diversified NPK mineral fertilization. The investigation was conducted on experimental plots sown with Virginia mallow, divided by means of narrow technological paths into two parts characterizing with various spacing of plant rows: plot 1 where spacing between rows of plants was 0.75 m and plot 2 where spacing between the rows was 0.50 m. In both cases the spacing between plants in rows was about 0.4-0.5 m and each experimental plot had an area of 2 700 m2. The highest content of investigated macroelements was noted in leaves of Virginia mallow, while the lowest in its roots. Carried out research indicate lack of significant influence of diversified level of fertilization on content of majority of analysed elements in biomass of Virginia mallow. In most cases, only two levels of fertilization significantly influenced level of calcium in plant material. Elevated content of calcium was observed in leaves of Virginia mallow when lower dose of fertilization was used. Moreover, no accumulation of nitrogen in stems and leaves of Virginia mallow was noted, and content of potassium and calcium observed in leaves and stems of Virginia mallow was several times lower than one recommended in order to ensure their care free usage

Content of chosen macroelements in biomass of Virginia mallow (Sida hermaphrodita Rusby)