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The present study was carried out to investigate the effects of nutrient concentration on plant growth and development of Dendranthema grandiflora Tzvelev. cv. Baekgwang in aeroponics. The nutrient solution were 1/4×,1/2×,1×,2× concentration of the balanced nutrient formula developed by Japanese Horticultural Experiment Station. Nutrient solution became more acidic when the solution concentration was higher. The plants grew better with 1/4× concentration at early stage, but became weak and pale green at later stage, indicating the nutrient was deficient. On the other hand, the plants grown on 2× concentration clearly showed the symptoms of excessive nutrition. Both photosynthetic activity and transpiration rate were higher with 1/2× and standard concentration than those on either 1/4× or 2× in solution concentrations. Chlorophyll content in the leaves decreased as the concentration of nutrient solution lowered. Cut flowers produced from 1/2× concentration were of superior in quality, while those from 2× concentration were less desirable. Days to flowering was shortened by 11 days, 8 days and 5 days in 1/4×, 2× and 1/2× concentration, respectively, as compared with standard concentration.
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