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KMID : 0903620010420010053
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Journal of the Korean Society for Horticultural Science
2001 Volume.42 No. 1 p.53 ~ p.56
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Effect of Electrical Conductivity of Nutrient Solution on Tipburn Incidence of Lettuce (Lactuca sativa L.) in a Plant Factory Using an Artificial Light Source
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Abstract
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In the plant factory using an artificial light source, root activities of butterhead lettuce ´Omega´ and leaf lettuce ´Grand Rapids´ were higher at 4.5 dS·m(-1)´ and 9.0 dS·m(-1)´ than that at 1.5 dS·m(-1)´ on the 1st day of treatment, but then they decreased over time and adapted to the high electrical conductivity (EC) on the 3rd day of treatment. Ion leakage and chlorophyll content in both lettuce at 9.0dS·m(-1) were more than two times higher than those at 1.5 dS·m(-1). Relative water content of lettuces reduced with increasing EC. Higher incidence of tipburn was observed only in butterhead lettuce as of 54.5% at 4.5 dS·m(-1) and 71% at 9.0 dS·m(-1). But there was no significant growth differences nor incidence of tipburn in leaf lettuce. Therefore, the incidence of tipburn was most likely to happen during butterhead´s head development stage, indicating that morphological differences between cultivars were limiting factors.
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