engleski

The Quality of Fresh Tomato Fruit Produced by Hydroponic

The quality of fresh tomatoes (Lycopersicon esculentum Mill.) planted in rockwool in hydroponic system is defi ned by their internal parameters: contents of dry matter and soluble dry matter (°Bx), total acidity (% citric acid), pH, % NaCl and L-ascorbic acid. Research was carried out during 2003 and included 21 cultivars. Tomato plants were planted into rockwool slabs 100 cm x 15 cm x 7.5 cm. Three plants were planted 33 cm apart in 11.25 L of substrate. The trial was laid out according to the randomized complete block design with four replications, and sampling was carried out during three harvests in: June, July and August. The dry matter content was 4.29% (cultivar Syta) to 6.21% (cultivar Delfine), and content of soluble dry matter was 3.0% (cultivar Brooklyn) to 4.5% (Lustro and 72-503). Total acidity amounted from 0.19% (cultivar Syta) to 0.45% (cultivar Lustro), and pH values ranged from 4.20 (cultivar 20377) to 4.68 (cultivar Syta). Salt content ranged from 0.08% (Campeon and F 18402) to 0.13% (Brooklyn and E 27. 31299), and L-ascorbic acid content ranged from 260.40 (cultivar Antinea) to 458.30 mg/dry matter (cultivar F 18402). By studying the basic chemical composition of selected cultivars, significant differences in their soluble dry matter and pH were revealed but only at the first sampling.

tomato; chemical composition; hydroponic system; cultivars

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