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No.36 (1989/12) >

 
Title :第 2 報土壌の pH と可溶性ケイ酸(サトウキビ増収法に関する土壌肥料学的研究)(農芸化学科)
Title alternative :2. Soil pH and soluble silica (Fertility Studies on Soils of Okinawa in Relation to Sugarcane Production) (Department of Agricultural Chemistry)
Authors :大屋, 一弘
黒潮, 恵子
外間, 安雄
Authors alternative :Oya, Kazuhiro
Kuroshio, Keiko
Hokama, Yasuo
Issue Date :5-Dec-1989
Abstract :赤色土3,灰色台地土2,灰色台地土1,暗赤色土2計8ヵ所のサトウキビ畑(NCo : 310,株出)について土壌のpHとケイ酸含量,土壌の可溶性ケイ酸とサトウキビ葉のケイ酸含有率などの関係を調べた。供試土壌のpH(H_2O)は4.2∿8.1の範囲にあったが,全ケイ酸は56∿61%でpHによる相違は認められなかった。しかし土壌の可溶性ケイ酸は低pHで少なく,高pHで多くなる傾向にあった。さらに可溶性ケイ酸含量は赤色土(PH4.2∿5.0)で2∿5mg/100g,灰色台地土及び灰色低地土(PH8.0∿8.1)で42∿48mg/100g,暗赤色土(pH5.2∿6.5)で28∿92mg/100gと土壌の種類による著しい相違が認められた。サトウキビ葉身のケイ酸含有率は0.88∿4.97%の範囲にあった。土壌の可溶性ケイ酸含量との関係についてはある程度正の相関が伺えるが,詳しく論じるには調査件数が不十分と考えられた。
It was aimed to study silica status in Okinawan soils planted to cane crops, because silica has been found profitable to the growth of sugar cane elsewhere. To start with, soil pH, total and soluble silica in the soil, and silica contents of cane leaves were investegated on the respective composite samples collected from 8 cane fields covered 3 Red soils, 2 Gray Upland soils, 1 Gray Lowland soil, and 2 Dark Red soils of Oiknawa. Soil samples were collected from 0 to 15cm, and plant samples were from leaf blades of fully developed No. 1 to 4 leaves of the ratoon crop started from February in the year of investigation. Soluble silica in the soil was determined by extracting with pH 4.01N acetic acid buffer solution. Total silica of the soil ranged from 56 to 61%, showing no relation to the pH values that ranged from 4.02 to 8.1. On the other hand soluble silica ranged from 2 to 92mg/100g and its abandance was related to higher pH values. In addition the quantity in soluble silica was characterized to some extent by soil groups. The silica contents of the cane leaf blades ranged from 0.88 to 4.97%. It was deemed the number of investigated samples was not enough to discuss positive correlation between the soluble silica contents of the soil and the percent silica of the leaf bleades.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3872
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.36 p.19 -23
Appears in Collections:No.36 (1989/12)

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