Dissolving Copper Sulphate

Bordeaux mixture is prepared in various strengths from copper sulphate, hydrated lime (calcium hydroxide) and water. The conventional method of describing its composition is to give the weight of copper sulphate, the weight of hydrated lime and the volume of water in that order. The percentage of the weight of copper sulphate to the weight of water employed determines the concentration of the Bordeaux mixture. Thus a 1% Bordeaux mixture, which is the normal, would have the formula 1 :1:100the first 1 representing 1 kg copper sulphate, the second representing 1 kg hydrated lime, and the 100 representing 100 litres (100 kg) water. As copper sulphate contains 25% copper metal, the copper content of a 1% Bordeaux mixture would be 0-25 % copper. The quantity of lime used can be reduced considerably. Actually 1 kg copper sulphate requires only 0.700 kg of pure hydrated lime to precipitate all the copper. Good proprietary brands of hydrated lime are now freely available but, as even these deteriorate on storage, it is safest not to exceed a ratio of 1:0.7:100 mixture.
In preparing Bordeaux mixture, the copper sulphate is dissolved in half the required amount of water in a wooden or plastic vessel. The hydrated lime is mixed with the balance of the water in another vessel. The two "solutions" are then poured together through a strainer into a third vessel or spray tank.
Take 50 litres of water and dissolve the Copper Sulphate, in the other 50 litres dissolve 700 gms lime. Use earthen, woodor plastic vessel for making the Solutions. Pour Copper Sulphate solution in to the lime Solution and stir it while mixing.
Bordeaux Mixture spray, an economic prevention, provides abroad spectrum of protective disease control by preventing or inhibiting the disease before the fungi or bacteria enter the plant. Bordeaux mixture has along residual action (ability to persist through rains and to adhere to plants) and has been successfully used forover 100 years for leafspots, blights, rots, anthracnose, downy mildew and cankers. When used as a basin drench treatment it controls the spread of root rot pathogens from diseased plants to healthy ones
To prepare the Most Effective Bordeaux Mixture
Strength 1% ie1:1:100
Bluesea's Copper Sulphate 1Kg.
Lime (Best Calcium Oxide)
  700gm to 1Kg.
Water 100 Litres

To Test Bordeaux Mixture before use


Performing any of the following tests can test the safety of the Bordeaux Mixture:

Litmus test: The Bordeaux Mixture is alkaline in reaction if it contains more proportion of lime. It should, therefore, turn red litmus paper blue. An excess of copper compound in the mixture may be dangerous to foliage of many plants and is indicated by solution turning blue litmus paper red.
Copper deposition test: To test the neutrality of the mixture, dip a brightened iron knife for a minute in the mixture. If the knife remains bright, the mixture is correctly prepared. If the knife turns rusty brown or if its brightness is lost,
add more lime solution and the test repeated till no such deposit appears on the clean metallic surface.
To get best results from the best Bordeaux Mixture

1.Usemost superior Copper Sulphate dark blue crystals / Granules or Sugar crystals.
2.Use the best quality lime for a neutral mixture only 700gms of Calcium Oxide (Quick lime) for lkg of Copper Sulphate    (1%).
3.pH of the mixture, between 9 to 10 for maximum efficiency.
4.Adjuvants like spreaders and wetting agents may be added to the mixture to enhance the sticking efficiency.
5.The mixture tends to sediment easily. Therefore, its stirring while using is desirable (a wooden stick is ideal)
6.Do not use the Bordeaux Mixture in combination with any other chemicals or pesticides.
7.The application of the mixture should be done on time with adequate coverage underneath the leaf surface for the    effective control on the spread of the fungus to newly generated young shoots.
8.Avoid spraying in exceptionally hot days, when the plants are showing signs of temporary wilting or in case of    continuous and heavy rains.

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