This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1922 Excerpt: ...adhesiveness is a desirable quality of copper
carbonate, it is not an accurate measure of its effectiveness. 3.
An experiment was conducted to determine the comparative
effectiveness of different brands of copper carbonate for the
prevention of smut from seed-borne spores (spring plantings). Two
varieties were used: Jenkins Club and Bluestem, each carrying
light, medium and heavy loads of smut, with 2 or 3 oz. per bushel,
making twelve plantings for each brand. In 108 tests with 9 brands
of pure copper carbonate, the average per cent of smut was 0. 39.
In these tests perfect control was obtained in 60. In 48 tests with
4 brands of copper carbonate testing 20% or less of metallic copper
there was an average of 1.28% smut. In 48 of these tests perfect
control was obtained in 14. In 12 untreated samples, there was an
average of 27.5% smut. None of the pure copper carbonates gave
perfect control in all of the 12 tests in which each brand was
used. The differences for the different brands were so slight that
one is not justified in proclaiming the superiority of the product
of any particular company. In general the compounds with low copper
content were not so effective as the pure copper carbonates. The
results obtained in this and preceding experiments indicate that 3
oz. of pure copper carbonate, or 4 oz. of the weak preparations,
per bushel, should be used for fall seedings. For spring seedings
2-3 oz. of pure copper carbonate, or 3-4 oz. of the weaker
preparation should be used, the heavier application being made only
when the seed is visibly smutted. 4. Tests were made of the
effectiveness of anhydrous copper sulphate for bunt control in
combination with varying amounts of Death Valley Chalk, calcium
carbonate and hydrated lime. The anhydrous copper sulpha...
|Country of origin:
||246 x 189 x 11mm (L x W x T)
||Paperback - Trade
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