The Journal of the Department of Agriculture, Victoria . on. 69: From the mineralphosphates and l)oii(s, such mannfac-tiired phosphatic fer-tilizers as super-phosphate, dissolvedbones, concentratedsuperphosphate. areobtained. , Phosphates of Lime.—The calcium com-pounds are by far themost important of thecompounds of phos-phoric acid, and aknowledge of these isof practical impor-tance to the farmer. Phosphoric acid(, )) formswith lime three dis-tinct compounds,namely, tricalcic, di-calcic, and monocalcicphosphate. In these three com-pounds, one part otphosphoric acid com-bines with th
The Journal of the Department of Agriculture, Victoria . on. 69: From the mineralphosphates and l)oii(s, such mannfac-tiired phosphatic fer-tilizers as super-phosphate, dissolvedbones, concentratedsuperphosphate. areobtained. , Phosphates of Lime.—The calcium com-pounds are by far themost important of thecompounds of phos-phoric acid, and aknowledge of these isof practical impor-tance to the farmer. Phosphoric acid(, )) formswith lime three dis-tinct compounds,namely, tricalcic, di-calcic, and monocalcicphosphate. In these three com-pounds, one part otphosphoric acid com-bines with three, two,and one part of limerespectively. The de-gree of solubilityof these compoundsvaries , the tricalcicform (3Ca, < )!%<),)containing one partof phosphoric acidcombined with threeparts of lime, is in-soluble in water, inweak organic acids,and is oidy soluble inmineral acfds. such assulphuric acid. It isthe form found inbones and in rockphosphate and corresponds to theinsoluble phosphateon the manureguarantee 696 Journal of Agriculture, Victoria. [11 Nov., 1912. Dicaleic phosphate (2(a(), H-iO, P2O5) is insoluble in water, butsoluble in wealc organic acids and in citrate of ammonia. It is theform in which the phosphate is found in reverted superphosphate. Monocalcie phosphate (CaO, 2H-2( >, P2O;,). so named because one unitof phosphoric acid is combined with one unit of lime, is freely solublein water, and is of innnediate value as plant food. It is the formfound in superphosphate, dissolved bones, &c., and corresponds to thewater soluble phosphate of the manure guarantees. The following table summarizes these facts:— 1. Tricalcic phos-~» phate (iiisol- Iuble phosphate 2. Dicalcic phos- phatevertedphate, ly phosphate ) 3. Monocalcie ^ phosphate | (water soluble jphosphate) J Re-/ phos- V slow- / soluble \ Composition. Lime I PhosphoricLime c acid Lime -> PhosphoricLime J acidWaterJ Lime \ PhosphoricWater \ acidWater > For
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectagricul, bookyear1902
