| Summary: | Horticultural substrates should promote seed germination and seedling emergence. The value of the SPAD index was significantly influenced by the type of substrate. The substrates had a beneficial effect on plant height in comparison with the control substrate. <i>Brassica</i> plants grown on the substrates used in the experiment had a compact growth habit, which is a desirable trait in seedling production. In general, macronutrient uptake differed in <i>Brassica</i> plants grown on various substrates. Significant differences in this parameter were observed mainly in broccoli (increase of approx. 14%) and white cabbage (decrease of approx. 30%) grown on PRO2, and in all plants grown on PRO3 (increase of approx. 9% in broccoli, decrease of approx. 33% in white cabbage, and decrease of approx. 15% in cauliflowers). The substrates decreased the total micronutrient concentrations in broccoli leaves by around 15% (PRO1) to around 40% (PRO3) relative to the control substrate. In comparison with the control treatment, micronutrient levels in cauliflower leaves increased by around 12% on PRO1 to around 35% on PRO3. In white cabbage, the total micronutrient content of leaves increased by around 24% on PRO1, and decreased by around 20% and 35% on PRO2 and PRO3, respectively, relative to the control treatment.
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