Wisconsin State Horticultural Society / Annual report of the Wisconsin State Horticultural Society for the year 1910
Volume XL, Part II (1910)
Richards, M. W.
How to make Bordeaux mixture, pp. 150-153 PDF (937.1 KB)
WINTER MEANG. sideration is the materials. It is made of Copper Sulphate com- monly called blue-stone or blue vitrol, stone lime and water. To make a satisfactory mixture the best materials it is possible to obtain should be used. Copper Sulphate often contains small percentages of iron sulphate but rarely in excess, or in sufficient quantities to interfere with the efficiency of the Copper Sulphate. If first class sulphate is bought very little difficulty will be ex- perienced as far as it is concerned. The lime, however, often offers serious difficulties. Lime contains mere or less impurities. If the percentage of calcium oxide is high the lime is technically known as a "fat" lime; this on addition of water, slacks quickly and completely and will perform its office in the compounding of Bordeaux Mixture in a satisfactory manner. If on the other hand the lime contains a large percentage of magnesia, clay or sand, it is known as "poor" lime. Such limes slack slowly and incompletely and do not make satisfactory Bordeaux. Air slaked lime should never be used as mixtures made with such lime are not only extremely injurious to foliage but are less adhesive and do not remain in suspension as long as mix- tures made with fresh stone lime. The water used in prepar- ing the mixture has very little to do with the efficiency of the Bordeaux. In spraying large commercial orchards large quan- tities of water are necessary and it is essential that the supply be ample and conveniently located. For the commercial orchard, wholesale quantities will be needed and the local drug store should not always be depended upon to supply the demand. Buy your materials from some. reliable dealer and in quantities large enough to take advantage of wholesale prices. The cost of materials will depend largely on the amounts bought, and the grade. The amounts needed will depend upon the size of the orchard, age of trees, number of times the trees are to be sprayed, and the season at which they are sprayed. On the average, one bar- rel (50 gal.) will cover twenty, 20 yr. old trees. At the pres- ent prices-8c per lb. for Copper Sulphate and lc per lb. for lime, 50 gal. Bordeaux Mixture will cost about 36c or 1.8 cents per tree. A 10 acre orchard with 104 trees per acre will re- quire 50 to 60 bbls. or from 200 to 250 lbs. Copper Sulphate and the same amount of lime for one spraying. These figures cannot be made absolute because they are based on estimates 151
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