…(e) River sand Sand from the upper reaches of rivers is angular and porous, so it is often mixed with clay soil for cultivation, used for cuttings and buds, and used for cultivating wild plants, cacti, succulents, and oriental orchids. Kiryu sand and Tenjingawa sand are well-known. Sea sand contains shell fragments and is of good quality, but it is necessary to wash off the salt. … *Some of the terminology that refers to "Kiryu sand" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…(e)川砂 河川上流の砂は角があり,空隙を保持するので,粘質土に混ぜて栽培に用いたり,挿木,挿芽に利用するほか,山野草,サボテンや多肉植物,東洋ランなどの栽培に愛用される。桐生砂,天神川砂などが著名である。海砂は貝殻片などをふくみ良質であるが,塩分を洗い去ることが必要である。… ※「桐生砂」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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