. Jahresbericht des New York State College für Landwirtschaft an der Cornell Universität und der landwirtschaftlichen Experiment Station. New York State College für Landwirtschaft; Cornell University. Landwirtschaftliche Experiment Station; Landwirtschaft - New York (State). Ländliche Schule Merkblatt 925 Während die Lösung von Kalk hinzugefügt wird, um das Kupfer Sulfat- Lösung in die Spritze tanlc verdünnen, das Material im Behälter sollte ständig gerührt werden. Der Himmel-blau bordeaux Mischung ist die Folge. Die Mischung sollte jetzt mit ein paar Tropfen einer Lösung von Kaliumhexacyanoferrat getestet werden. Dies ist durch Auflösen von crysta gemacht

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. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Rural School Leaflet 925 While the solution of lime is being added to the dilute copper sulfate solu- tion in the sprayer tanlc, the material in the tank should be stirred constantly. The sky-blue bordeaux mixture will result. The mixture should now be tested with a few drops of a solution of potassium ferrocyanide. This is made by dissolving crystals of potas- sium ferrocyanide in soft water. Five cents' worth of crystals dissolved in a pint of water will provide enough of the solution to last throughout the season. Should a brown-colored precipitate result when a few drops of this solution are added to the bordeaux mixture, it would indicate that more limewater is needed to neutralize the copper sulfate solution. When sufficient lime is added no precipitate will be formed by the potassium ferrocyanide solution. Bordeaux mixture not properly neutralized will burn the foliage of plants when applied to it. POTATO SCAB This disease is characterized by a roughened, brown, corky area on the surface of the tuber. While these affected areas extend but slightly below. Potato tubers badly affected with scab the skin, the appearance presented by scabby potatoes renders them less valuable than smooth ones. The yield also from fields where the tubers are badly scabbed is inferior. So that it is desirable, from the grower's point of view, to grow clean potatoes. Potato scab is common throughout the United States and Europe where potatoes are grown. The surface of a tuber may be roughened by worms and grubs, but this is unlike the scab. In Europe several organisms are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustra