Potatoes

Japanese: いもご

...It is a clay mineral named by Yoshinaga Naganori and Aomine Shigenori (1962), and was named after the glassy volcanic ash soil called "Imogo" in Kyushu that was isolated and confirmed. Chemically, it is a hydrate (SiO ₂ ·Al ₂ O ₃ ·2.5H ₂ O) in which silica and alumina are bonded in a fixed ratio of 1. ...

From [Volcanic Ash Soil]

...The new unweathered pumice layer that erupted from Sakurajima is called "Bora" and is found just below the surface of the soil, making it a hindrance to deep-rooted crops such as Sakurajima radishes. The weathered glassy volcanic ash that erupted over a wide area from the Kikai Caldera off the coast of Kagoshima is called "Akahoya" in southern Kyushu and "Imogo" in Kumamoto. These soil layers appear at various depths below the surface, but deeper soil layers are increasingly being exposed to the surface due to large-scale land alteration, and their fertility and soil engineering properties have often come into question. ...

From [Special Soil]

…It refers to special volcanic deposits such as Shirasu (volcanic deposits of plagioclase trachyte found in southern Kyushu), Bora (colloquial name for pumice found in southern Kyushu), Kora (slightly consolidated volcanic gravel found at the southern tip of the Satsuma Peninsula in Kagoshima Prefecture), Masa (volcanic gravel around Mount Fuji), Akahoya, Onji, Imogo, and other volcanic ash layers, as well as weathered granite soils and other soils that are particularly susceptible to erosion. They are found mainly in Kyushu, Shikoku, and Chugoku, but are particularly widespread in the southern Kyushu region. Special soil areas are vulnerable to erosion, are subject to extremely severe damage during heavy rains, and have low agricultural productivity, but agricultural productivity has improved significantly by removing or crushing these soils. …

*Some of the terminology explanations that mention "imogo" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…吉永長則，青峰重範により命名(1962)された粘土鉱物で，九州の〈いもご〉と呼ばれるガラス質火山灰土壌から分離確認されたのでこの名がつけられた。化学的にはシリカとアルミナが分子比1の割合で一定の結合をした水和物(SiO₂･Al₂O₃･2.5H₂O)である。…

【火山灰土壌】より

…桜島から噴出した新しい未風化の軽石層は〈ぼら〉と呼ばれ，表土のすぐ下に出るため桜島ダイコンなどの深根性作物にとって邪魔になる。また鹿児島沖の鬼界カルデラから広範囲に噴出したガラス質火山灰の風化物は，九州南部では〈あかほや〉，熊本では〈いもご〉と呼ばれる。これらの土層が出現する地表からの深さはさまざまであるが，深い所にある土層も大規模な土地改変のために地表に露出することが増えており，その肥沃性や土質工学性がしばしば問題にされるようになってきた。…

【特殊土壌】より

…シラス(南九州に分布する斜長石英粗面岩質の火山堆積物)，ボラ(南九州に分布する軽石の俗称)，コラ(鹿児島県薩摩半島南端に分布するやや固結した火山砂礫（されき）層)，マサ(富士山周辺の火山砂礫層)，アカホヤ，オンジ，イモゴと呼ばれる火山灰層などのように，特殊な火山噴出物および花コウ岩風化土，その他とくに侵食をうけやすい土壌をいう。九州，四国，中国を中心に分布するが，とくに南九州地方に広く分布する。特殊土壌地帯は侵食に弱く，豪雨時にはきわめて大きな被害をうけやすく，また農業の生産性も低いが，これらの土壌の排除または破砕により農業の生産性は著しく向上している。…

※「いもご」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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