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The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus >
No.26 (1979/12) >

 
Title :水滴による土塊の崩壊に関する研究 (1)(沖縄における農地保全の基礎的研究 X)(農業工学科)
Title alternative :Studies on the Soil block disintegration by simulated rainfall (Fandamental Studies on Farmland Conservation in Okinawa X.) (Department of Agricultural Engineering)
Authors :翁長, 謙良
照喜名, 良達
Authors alternative :Onaga, Kenryo
Terukina, Yoshitatsu
Issue Date :11-Dec-1979
Abstract :以上の結果を要約すると1.モンモリロナイトを含むジャーガル供試体はマージ供試体に比し初期含水比が高く, 収縮も大である。2.両供試土塊に耐崩壊性の高い含水状態が出現し, それらの値はマージが27%前後, ジーガルは23%前後である。3.両供試土塊の崩壊度の差異は主要粘土鉱物の相異によるものと思われる。4.低含水比域での崩壊度のばらつきは, 土粒子の配向, 配列の違いによるものと考えられる。
The purpose of this study is to establish an index of soil erodibility by moisture contents of soil. The disk type soil blocks (D=10cm, H=4cm) made of Maji and Jagaru were exposed to simulated rainfall and were investigated concerning their disintegration. Physical properties of the soils are shown in table 2. The number of soil blocks tested was 36 respectively. The results of the experiment are as follows : 1. Jagaru soil blocks with monmolironite minerals contain higher moisture contents than Maji soil blocks at their initial stage. 2. There will be most anti-disintegration moisture contents in both soil blocks and they are above 27% in Maji and above 23% in Jagaru. 3. The difference of the degree of disintegration of the soil is probably to the degree of minarl contents which affected shrinking of the soil.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/4165
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.26 p.341 -346
Appears in Collections:No.26 (1979/12)

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