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The Action of Carbon Dioxide on Bordeaux Mixtures

Published online by Cambridge University Press:  27 March 2009

C. T. Gimingham
C. T. Gimingham
Affiliation:
University of Bristol.
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Extract

The fungicidal properties of the insoluble copper compounds, present in Bordeaux mixtures, have long been known, and it is an important point to ascertain the precise manner in which the poisonous action is exerted. A variety of theories have been put forward, but the matter cannot be regarded as settled. It has been generally accepted that, in order to account for the fungicidal action, it is necessary to look for some means by which the insoluble copper in Bordeaux mixture is rendered soluble when the material is sprayed on to foliage. Atmospheric carbon dioxide has frequently been suggested as the most important agent by which this is effected, and recently this view has been urged by Mr S. U. Pickering, F.R.S., who has also investigated in detail, the chemical nature of the compounds found in Bordeaux mixtures.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 4 , Issue 1 , May 1911 , pp. 69 - 75
Copyright
Copyright © Cambridge University Press 1911

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References

page 69 note 1 Journ. Chem. Soc. 1907, XCI. 1988.Google Scholar

page 70 note 1 See also Pickering, Journ. Agric. Set. Vol. III. p. 171.Google Scholar

page 70 note 2 The potassium ferrocyanide colorimetric method, as detailed in Sutton's Volumetric Analysis, 8th ed. p. 213, was employed throughout and found to give very satisfactory results, the addition of ammonium nitrate to the liquids making the colour a more pronounced pink and rendering the test very sensitive.

page 74 note 1 J. d'Agr. Pract. May 19, 1887.

page 74 note 2 Landw. Jahrb. XXXIII. 1904, p. 517.Google Scholar