A Study on the Mechanism of Water Retention in Aggregate Like Soil “Akadama”

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  • 団粒性用土 「赤玉」 の水分保持機能について
  • ダンリュウセイ ヨウド アカダマ ノ スイブン ホジ キノウ ニ ツイテ

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In many cases, landscape plants are placed in soils of bad conditions. Therefore, landscape plants suffer from bad drainage or lack of water. Aggregated soils have properties of favorable drainage and water retention ability in low soil water potential. Akadama is a sort of aggregate soil for horticultural use, sold in commercial market. In this paper, physical properties of Akadama as a aggregate body is investigated whether the general knowledge, the compatibility of the conductivity for soil water and gas, is valid or not. Obtained results are as follows;<BR>(1) Inter aggregate pore volume increased 9% more than a single aggregate particle.<BR>(2) Evaporation rate becomes larger in paste body rather than in aggregate body, because the liquid water movement is prominent in paste body.<BR>(3) In aggregate body, liquid water movement is prominent rather than vapor water movement in early stage of the evaporation test. It is after reaching the wilting point that vapour water movement becomes prominent.

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