Abstract
PREVIOUS experiments at Jealott's Hill1 showed that the sodium salts of 2-methyl 4-chlorophenoxyacetic acid (‘Methoxone’) and 2 : 4-dichlorophenoxy acetic acid (DCPA) were similar in their effects on cereal crops on which they were dusted or sprayed in heavy doses, although only the latter produced marked malformations. Synerholm and Zimmerman had earlier pointed out2 for other plants the greater activity of 2 : 4-dichlorophenoxyacetic acid compared with 2-methyl 4-chlorophenoxyacetic acid in inducing formative effects. When, instead of the sodium salts, oil-soluble esters of the two acids are compared on weed-free cereals, the differences as reflected in the grain yields become very marked, as shown, for example, in the accompanying table.
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References
Templeman, W. G., and Halliday, D. J., Emp J. Exp. Agric., 18, No. 71, 169 (1950).
Synerholm, M. E., and Zimmerman, P. W., Contr. Boyce Thompson Inst., 14, No. 2, 91 (1945).
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TEMPLEMAN, W., WRIGHT, J. Relative Effects of the n-Butyl Esters of 2-Methyl 4-Chlorophenoxyacetic Acid and of 2 : 4-Dichlorophenoxyacetic Acid on Cereals. Nature 167, 71–72 (1951). https://doi.org/10.1038/167071b0
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DOI: https://doi.org/10.1038/167071b0
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