The Effect of Different Source of Iron on Nutritional Value of Greenhouse Tomato Fruit Grown in Peat Substrate

The aim of the investigations conducted in 2005-2006 was to estimate the effect of different kind of iron chelates: Fe 8 Forte (EDTA), Top 13 (EDTA+DTPA) and Librel Fe DP7 (DTPA) and iron concentration 50, 75 and 100 mg Fe·dm^-3 in growing medium on the yield and fruit quality of greenhouse tomato cv. 'Merkury F₁'. Tomato plants were grown in peat substrate produced by Hartmann, which characterized natural low iron content. The experiment was set up in two factorial design in three replications. One plot covered 6 plants grown in spacing 0.6x0.5 m, plant population was 3.0 per 1 m². The best yield of greenhouse tomato cv. 'Merkury F₁' was recorded when Fe 8 Forte in 75 mg Fe·dm^-3 while Fe 13 Top and Librel Fe DP7 in concentration of 100 mg Fe·dm^-3 were used. There was not recorded any strongly effect of tested fertilizers and iron concentration in substrate on the nutritional value of fruits.