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This study was conducted to determine the optimum hydroponic system and nutrient solution for the growth of leaf lettuce (Lactuca saliva L. var. crispa). Aeroponics, NFT and deep flow technique (DFT) were employed, and nutrient solutions used were Cooper solution, universal solution, Yamazaki solution and balanced nutrient solution by Japanese Horticultural Experiment Station, respectively. Leaf area was highest in the NF´T at the treatment of balanced nutrient solution of Japanese Hortiultural Experiment Station than the other nutrient solution as of 54.1 d㎡ on 25 days after transplanting. Same results were obtained in fresh and dry weight as of 302.96 g and 17.19 g, respectively. NFT was the most recommendable system than the other systems in terms of growth characteristics. Aeroponics showed higher biomass production than that of DFT system, but leaf area was observed reverse trend. Dry matter partitioning ratio of hydroponically grown lettuce was closely related to changing time of nutrient solution. In aeroponic system, dry matter partitioning ratio to the root was much more than the other systems, and dry matter partitioning ratio to the leaf in the treatment of balanced nutrient solution of Japanese Horticultural Experiment Station was higher than in the other nutrient solutions. Hydroponic system was more influenced to the T/R ratio than that of nutrient solutions. T/R ratio was lowest in aeroponic system compared to the other systems.
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