Availability of Tennessee raw rock phosphate in relation to fineness and other factors
1926
Conner, S.D. | Adams, J.E.
Commercial fine ground raw Tennessee phosphate was compared in pot culture with the same material reground in a ball mill. The reground phosphate was only 7.7% more effective than the commercial phosphate. The finest mechanical separate in the phosphate (clay) was 10% more effective than the commercial phosphate. The pot tests on these two phosphorus hungry soils do not indicate that it would pay to grind such phosphate finer for use as fertilizer in the raw form. The relative effectiveness of the phosphates tested was as follows: Mono-calcium phosphate, 100; di-calcium phosphate, 87.7; commercial raw ground phosphate, 45.1; reground commercial raw phosphate, 52.8. The addition of sulfur to the raw phosphate gave an increase on one soil and a decrease on the other soil. Carbonate of lime reduced the availability of the raw phosphate on both soils.
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