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KMID : 0903620000410010036
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Journal of the Korean Society for Horticultural Science
2000 Volume.41 No. 1 p.36 ~ p.40
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Influence of pH and NO3 / NH4 Ratio of Nutrient Solution and Particle Size Distribution of Rice Hull on Growth of Hot Pepper Seedling in Expanded Rice Hull - based Substrates
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김광용/Kim, Kwang Yong
이병일/강성희/이지원/Lee, Byoung Yil/Kang, Sung Hee/Lee, Jin Won
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Abstract
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The seedling growth in fresh rice hull-based substrate is suppressed, but the cause is not clear. This experiment was conducted to find out the influence of pH and NO₃/NH₄ ratio of nutrient solution, and particle size distribution of rice hull on the growth of hot pepper seedling in rice hull-based substrates. Hot pepper was raised on 128-cells plug tray with nutrient solution composed of N-P-K-Ca-Mg=8.0-2.4-2.4-4.8-1.6 me·L^(-1), which was applied every 1∼3 days according to the growing stages. Nutrient solutions that pH were 4.5, 5.0, 5.5, 6.0 and 6.5 were, and NO₃/NH₄ ratios were 90:10, 75:25, and 50:50, were supplied in expanded rice hull-based substrate by nutritional regimes during raising seedling. Rice hull-based substrates with 4 particle sizes of under 0.59, 0.59∼1.0, 1.0∼1.41, and over 1.41 ㎜ were mixed with 25% perlite and 25% peat moss, respectively. Regardless of nutrient solution pH, the growth of hot pepper seedling was worse in rice hull-based substrate than the mixture of peat moss and perlite. Rice hull substrate pH was not influenced by applied nutrient solution pH, but the growth of seedling was best in nutrient solution of pH 4.5. In fresh expanded rice hull-based mixtures, the growth of hot pepper seedling was inferior to the mixture of sphagnum peat moss and perlite regardless of NO₃/NH₄ ratio of fertilizer solution, but increased slightly in fertilizer solution with high NO₃/NH₄ ratio. Substrate pH was low as fertilized with high NO₃/NH₄ ratio. Fresh expanded rice hull with varying particle sizes resulted in poor seedling growth compared to control substrate, however, in the same composition the best growth was found in the substrate with particle sizes of from 0.59 to 1.00 ㎜. As the particle size of fresh expanded rice hull decreased, pH increase of substrate was getting higher after sowing.
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