The Efficiency of Various Particle-Size Fractions of Limestone
1960
Motto, H. L. | Melsted, S. W.
The relative efficiency of various fractions of a calcitic limestone was studied under greenhouse conditions. Pure calcium carbonate, a commercial sample of agricultural limestone, and 6 particle-size fractions separated from this commercial sample were applied at different rates to 3 acid soils. The soils were sampled at various times and the pH determined. The changes in pH with time followed an expression of the form, pHf = pHₒ + b Log (1 + t). The factor b varied with rate of application, particle size, and soil. The limestone particles in the 10- to 28-mesh size fraction were, in general, 14% as effective as those in the < 100-mesh fraction, and particles > 10 mesh were essentially of no value. The efficiency of the commercial sample of agricultural limestone was approximately equal to that exhibited by the 40- to 60-mesh fraction of the sample. The results indicate that, for practical purposes, a large portion of commercial limestone should be ground fine enough to pass a 40-mesh sieve.
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