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Published online by Cambridge University Press: 12 June 2017
It has been noted frequently that salts of 2,4–dichlorophenoxyacetic acid, such as sodium or triethanolamine salt, are effective as herbicides in regions of moderate rainfall, while in arid regions they are sometimes relatively ineffective. Usually, and particularly under arid conditions, the aliphatic esters of 2,4–D have been more effective as herbicides than the salt forms.