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KMID : 0903619980390020152
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Journal of the Korean Society for Horticultural Science
1998 Volume.39 No. 2 p.152 ~ p.156
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Nitrate , Soluble Protein , Amino Acid Content , and Enzyme Activity by Nitrogen Source of Leaf Lettuce and Water Dropwort Grown with Hydroponics
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이응호/Lee, Eung Ho
이재욱/이병일/권영삼/이용범/Lee, Jae Wook/Lee, Byoung Yil/Kwon, Young Sam/Lee, Yong Beum
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Abstract
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The growth of leaf lettuce (Lactuca saliva L.) and water dropwort (Oenanthe stolonifera DC.) was better in control (NO₃^--N : NH₄^+-N = 6 : 0.5 meq/L) than other treatments, while the growth was not good in (NH₄)₂SO₄. However, the growth was better in (NH₄)₂CO₃ than in NH₄NO₃. This result proposed a possibility of using (NH₄)₂CO₃ as a new nitrogen source in hydroponics. When the (NH₄)₂CO₃ was used as nitrogen source and the pH was adjusted every 3 days, growth of leaf lettuce and water dropwort was lower by 20% than currently used cultural methods. However, it was possible to produce leaf lettuce and water dropwort using (NH₄)₂CO₃ as nitrogen source by adjusting pH to optimum range for the crop growth, and the NO₃ content could be reduced to 500 ㎎·㎏^(-1) which was 1/10 of that in the conventional methods. Total amino acid was highest in (NH₄)₂SO₄ with 8-9 nM·g^(-1), while it was lowest in control with 1-2 nM·g^(-1). Soluble protein contents were highest in control followed by (NH₄)CO₃, NH₄NO₃, and (NH₄)₂SO₄. The contents were 4-5 ㎎·g^(-1) in control and 1-2 ㎎·g^(-1) in (NH₄)₂SO₄. Contents of alcohol insoluble solids, pectin, hemicellulose, and cellulose were highest in (NH₄)₂SO₄ and lowest in control and (NH₄)₂CO₃.
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