Abstract
THE recent communication by Heath and Clark1 prompts us to present some of our observations of presumed plant hormone effects of the chelating agent ethylenediamine tetra-acetic acid. Reference to these observations was made in a review on the application of chelation to agriculture2. Our interest in this problem developed from observations, made in the summer of 1953, on massive growth response to ethylenediamine tetra-acetic acid by sunflower plants in water culture; metal complexing effects in the nutrient medium were involved, but there was also evidence of a direct effect of ethylenediamine tetra-acetic acid itself on growth.
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References
Heath, O. V. S., and Clark, J. E., Nature, 177, 1118 (1956).
Haertl, E. J., Down to Earth, 2 (1), 6 (Dow Chemical Co., Midland, Michigan, 1955).
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WEINSTEIN, L., MEISS, A., UHLER, R. et al. Growth-promoting Effects of Ethylene-diamine Tetra-acetic Acid. Nature 178, 1188 (1956). https://doi.org/10.1038/1781188a0
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DOI: https://doi.org/10.1038/1781188a0
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