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This experiment was conducted to find out the difference of growth and inorganic element contents of hot pepper seedlings between fresh and decomposed rice hull substrates. The expanded rice hull composted for 5 months at 50℃ with 300 ㎎·L^(-1) urea, was used for mixtures. Hot pepper seeds were sown and raised in 128-cell plug tray filled with the mixtures that the ratios of sphagnum peat moss/rice hull are 100/0, 80/20, 60/40, 40/60, 20/80, and 0/100 (%, v/v). All the mixtures were conditioned to pH 6.0∼6.5 with dolomitic lime before sowing. Nutrient solution composed of N-P-K-Ca-Mg=8.0-2.4-2.4-4.8-1.6 me·L^(-1) was applied every 1∼3 days by growing stages. In fresh rice hull-based substrates, the seedling growth was less as rice hull ratio increased, but in decomposed rice hull-based substrates was best in the mixture of 40% sphagnum peat moss and 60% decomposed rice hull. In the fresh rice hull-based mixtures, root vitality, chlorophyll content, and leaf N and Fe contents of seedlings were decreased as the rice hull ratio increased. However, in the decomposed rice hull-based mixtures, root vitality, leaf N and Fe contents of seedlings did not show differences between the substrate compositions but chlorophyll content was getting higher as the rice hull ratio increased.
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