A comparison of some effects of blast furnace slag and of limestone on an acid soil
1930
Crane, F.H.
Blast furnace slag and limestone were compared in greenhouse and laboratory tests. On the gross ton basis 100-mesh limestone was somewhat superior to 100-mesh slag in its effects on red clover growth and soil reaction with the soil used, but on the basis of CaCO3 equivalent, as determined by titration using phenolphthalein as indicator, the two materials had nearly the same effectiveness. The CaCO3 equivalent of these materials, as computed from their contents of total calcium and magnesium, was a less satisfactory measure of their relative effectiveness, as shown by clover yields and effects on soil reaction, than was the CaCO3 equivalent obtained by titration. Four-ton applications of granulated slag gave results approximately equal to those from 1 ton of 100-mesh slag.
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