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Abstract
Concentrations of culture solution in hydroponics were changed for the purpose of improving the quality of herbs. Culture solution containing Ca(NO3)2·4H20:45g. KNO3:36g. MgSO4·7H20:22. 5g. NH4H2PO4:6. 75g, and Fe-EDTA:6. 67g in \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(45{\ell}\) \end{document} water was defined as 1 unit solution. Japanese honewort (Cryptotaenia japonica Hassk). soup celery (Apium graveolens L. var. dulce DC.). and parsley grown with 2 unit solution showed higher contents of ascorbic acid(ASA). phenols, free amino acid, and chlorophyll than those grown with 1 unit, but they showed lower yields and shorter shelf lives. Lowering the concentration of solution to 2/3 unit resulted in the increase of yield of peppermint, sage, basil, and perilla (Perilla frutescens Britton) and the decrease of ASA and chlorophyll contents. Shelf lives of berbs with 2/3 unit were longer than those with 1 unit. The smell of herbs tested in this experiment was not affected significantly in sensory test by the change of concentration of solution.
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