In the experiments carried out in the years 1998-1999 the effect of inert media and fertilization levels on the nutrition status of greenhouse tomato cv. ‘Maeva F₁’ was investigated. Two feeding solutions were used: I, containing (in mg dm^-3): N-NO₃ – 189, P – 62, K – 371, Ca – 190, Mg – 49, Fe – 0.84, Mn – 1.87, B – 0.32, Zn – 2.01, Cu – 0.048, Mo – 0.048, pH 5.5, EC – 3.2 mS cm^-1; and solution II with the concentration increased by 20%, and three inert media: rockwool (Grodan), polyurethane foam (Inert) and expanded clay (granulation 4–8 mm). In the index parts of the tomato (9–10 leaf from the top) the mean content of nutrients was (% in d.m.): N – 3.69, P – 0.41, K – 5.30, Ca – 7.49, Mg – 0.55. No significant effect was found for the studied media – rockwool, expanded clay and polyurethane foam – on the nutrient content in the index parts of the greenhouse tomato, except for phosphorus. Fertilization levels also did not affect significantly content of these nutrients in the index plant parts.

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