Bordeaux mixture, process for its manufacture and cupric fungicidal compositions containing it
AssigneeElf Atochem Agri S.A.
InventorsMichael Courtade, Georges Ramel
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Abstract
The invention relates to a Bordeaux mixture in which virtually all of the copper is in the form of brochantite and which, in dry form, contains not more than 20% by weight of bassanite. The absence of cupric complexes other than brochantite and a small amount of bassanite in the dry product makes it possible to avoid the drawbacks of standard Bordeaux mixtures.
Claims18
In a Bordeaux mixture, the improvement consisting of copper in the form of brochantite and not more than 20% by weight of bassanite.
Process for the manufacture of a Bordeaux mixture, comprising reacting an aqueous copper sulphate solution and an aqueous suspension of lime in a Ca(OH).sub.2 /CuSO.sub.4 molar ratio of between 0.60 and 0.75, at a temperature and for a period of time which convert the copper complexes exclusively into brochantite and not more than 20% by weight of bassanite.
Proceeds for the manufacture of the Bordeaux mixture in which copper consists in the form of brochantite and not more than 20% by weight of bassanite, which consists of, after an optional step of concentration, drying an aqueous suspension having solids of about 47% by weight of brochantite and 53% by weight of gypsum under conditions wherein the weight content of copper in the product does not exceed 27.3%.
Method of treatment of crops comprising fungicidally treating crops with a Bordeaux mixture to which the copper consists of brochantite and not more than 20% by weight of bassanite.
Dependencies are inferred from the claim text.