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Certain “Glassy” and Crystalline Calcium Silicate Materials: Their Distinctive Behavior and Liming Effectiveness as Registered by Plant Response and Soil pH
Author(s) -
MacIntire W. H.,
Winterberg S. H.,
Clements L. B.
Publication year - 1946
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1946.03615995001000c00012x
Subject(s) - chemist , citation , chemistry , library science , political science , computer science , organic chemistry
CONTRIBUTIONS as to the liming effectiveness of calcium silicate—as wollastonite, as a "di-Ca" by-product, and as slag—have been cited in bibliographies from the Tennessee Experiment Station (i, > 3)The subject has become of economic importance now that two distinctive types of calicum slags are being produced from dissimilar operations and used extensively for soil liming in certain regions, of the United States. The present paper stems from certain observations as to divergence in behavior of the "glassy" and crystalline types of calcium silicate when incorporated into soils, in contrast with similarity in behavior when suspended in carbonatated water. To that medium both types yield a supersaturated solution of calcium bicarbonate (i, 2, 6, 13). After incorporation into soils, a glassy calcium silicate slag undergoes carbonatation rapidly, whereas the CaSiOg of wollastonite suffers no determinable conversion to CaCO3 when likewise incorporated. Allowed to cool slowly, a melt of that mineral regains crystallinity, whereas quenching of the melt produces a "glassy" material that behaves as does the quenched calcium slag that comes from the phosphate-reduction furnace, in that both quenched materials undergo carbonatation readily after incorporation into soils (4). This contribution deals with the plant responses and with the distinctions in the pH values that were registered by the soils in pot cultures wherein the glassy and crystalline forms of calcium silicate had registered marked variances in the extent to which they underwent carbonatation (4).