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The effects of soil and rockwool as substrates, soil-and rockwool-system, respectively, on the fluctuation of ion concentration in a drained nutrient solution of a closed fertigation system and the growth and yield of tomato (Lycopersicon esculentum Mill. cv. Hausu-Momotaro) were compared. The following results were obtained 149 days after transplanting. 1. The pH of the drained nutrient solution fluctuated less in the soil-system than it did in the rockwool-system. 2. The composition of both cations and anions was more stable in the soil-system than it was in the rockwool-system. In the rockwool-system, sodium and sulphate concentrations increased between 89 to 126 days after transplanting while those of potassium and nitrate decreased. 3. Physiological disorders were not observed in both soil-and rockwool-systems. 4. Vegetative growth was more vigorous and total yield was higher in tomato plants grown in the rockwool-system than in the soil-system but the percentage of marketable fruits was higher in the latter. There was no significant difference in the marketable yields between the two systems. 5. Closed-fertigation soil-system may be more suitable for tomato fruit production than the rockwool-system because of the stability of the pH and ion composition of the drained nutrient solution.

Comparison between Soil and Rockwool as Substrates Utilizing a Drained Nutrient Solution for Growing Tomatoes in a Closed Fertigation System.