Discussion
The major ingredient of Bordeaux mixture is :
Answer: B
The major ingredient of Bordeaux mixture is copper sulphate.
Bordeaux mixture, developed by Pierre-Marie-Alexis Millardet in France in the 1880s against downy mildew of grapes, is made by mixing copper sulphate solution with slaked lime (calcium hydroxide). The copper ions are the fungicide; the lime neutralises the solution so it does not scorch the leaves. A common strength is 1 per cent, made from equal weights of copper sulphate and lime.
Potassium chloride, magnesium sulphate (spelt Megnesium in the paper) and ammonium nitrate (spelt Ammoniun) are fertilisers, not ingredients of this fungicide.
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