…a chemical used to control weeds that harm crop cultivation. In the past, weed control in agriculture was mainly done by hand, but the demand for the development of herbicides to save labor increased, and research and development of herbicides progressed rapidly. Attempts were made to use inorganic salts as herbicides, but in the process of investigating the activity of synthetic auxins (a type of plant hormone, see the entry on auxin), it was discovered that 2,4-dichlorophenoxyacetic acid (2,4-D) exhibits strong auxin activity at low concentrations and herbicidal activity at high concentrations, opening up a new frontier in the development and research of herbicides. … *Some of the terminology explanations that mention "benzoic acid herbicides" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…作物の栽培に害を与える雑草の防除に用いられる薬剤。古くは農業における雑草の防除は主として人力によって行われていたが,省力化のため除草剤の開発に対する要求が高まり,その開発研究が急速に進められた。除草剤として無機塩を用いる試みもなされたが,合成オーキシ(植物ホルモンの一種,〈オーキシン〉の項目を参照)の活性を追究する過程で,2,4‐ジクロロフェノキシ酢酸(2,4‐D)が低濃度では強力なオーキシン活性を,また高濃度では殺草活性を示すことが見いだされ,除草剤の開発研究に新しい局面が展開することになった。… ※「安息香酸系除草剤」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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