Fundamental Research on the <i>Suna Saibai</i> (a type of sand culture)

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  • TOYAMA Masao
    Faculty of Agriculture, Kyushu University Sand Dune Research Institute, Tottori University

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Other Title
  • 砂栽培に関する基礎的研究 (第4報)
  • 砂栽培に関する基礎的研究-4-砂の粒径組成と制御環境下でのキュウリの初期生育との関係〔英文〕
  • スナ サイバイ ニ カンスル キソテキ ケンキュウ 4 スナ ノ リュウケイ ソセイ ト セイギョ カンキョウ カ デ ノ キュウリ ノ ショキ セイイク ト ノ カンケイ エイブン
  • Fundamental Research on the Suna Saibai (a type of sand culture)
  • IV. Relationship between the Physical Composition of sand media and the growth response of cucumber seedlings grown under controlled environment
  • 砂の粒径組成と制御環境下でのキュウリの初期生育との関係

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Abstract

To study the relationship between the growth of cucumber seedlings and the fraction systems of sand, the present experiments have been performed in a phytotron growth-room and in a plastic house from July through August in 1969. Results obtained in both phytotron and house were compared with each other.<br>1. In the comparison between very coarse sand (2-1mm) and fine sand (0.2- 0.02mm) media, under the four different kinds of day-lengths, i. e., 8, 12, 16 and 24 hours, the largest difference in the fresh and dry weights of the tops and of the roots of cucumbers was found under the 16-hour day condition. The difference in the growth between the two different culture media became significant on the 8th day of experiment.<br>2. Several growth characters, such as stem length, leaf area, top and root weights, were compared among the three different media, very coarse, coarse (1.0-0.5 mm) and medium (0.5-0.2mm), revealing that there prevails a similar tendency with each respective medium. Each growth character was compared by its growth index which was expressed as a percentage of the standard value realizing in fine medium. Thus the growth indices for medium became to range between 80-90%, for coarse 40-50%, and for very coarse 35-40%, as against 100% for fine medium.<br>3. When very coarse sand medium was mixed with medium or with fine sands, being increased in quantity by weight ratio with an interval of 20%, the dry top weight of seedling showed a steady increase until the mixed proportion attained 40 % in the case of medium, and to 20% in the case of fine. Quite similar results were obtained in both in the phytotron growth-room and in the plastic house

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