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This study was conducted to determine yield of hydroponically grown determinate tomato cultivars at different plant densities. Four determinate tomato cultivars were subjected to four plant densities during the spring/summer  and summer/fall seasons. Results showed no significant differences in marketable yield between the cultivars tested during both seasons. Cultivar Mion showed higher incidence of blossom end rot, while Mariana showed the highest fruit rot during the spring/summer season as compared to the other cultivars.  During the spring/summer season, marketable yield increased with increased plant density with the highest yield obtained at 25 plants m -2 followed by 20 plants m -2 . During the summer/fall season, plant density did not show a significant effect in total and marketable yield although a tendency for declined yield with increased density was observed. Number of fruit per plant as well as fruit size decreased with increased plant density during both seasons which did not have an effect on overall yield per plot area.  Results demonstrated that increasing the plant density to 25 plants m -2 can improve marketable yield of determinate tomato cultivars during spring/summer season while using a plant density of 10 plants m -2 will be more cost effective during the summer/fall season. Keywords: Gravel film technique, Marketable yield, Unmarketable yield, Soilless cultivation

Yield of determinate tomato cultivars grown in a closed hydroponic system as affected by plant spacing