. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . tly as a fertilizer, or it may be introduced into mix-tures of other fertilizer materials. Dissolved steamed bone necessarily varies somewhat incomposition according to the character of the bone usedin its manufacture. It may be safe to say that it usuallycontains from 1 to 3 per cent of nitrogen. It also containsfrom 15 to 18 per cent of phosphoric acid, the majorportion of which is soluble in water. (See Fig. 20.) 351. Dissolved bone-black. — Th
. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . tly as a fertilizer, or it may be introduced into mix-tures of other fertilizer materials. Dissolved steamed bone necessarily varies somewhat incomposition according to the character of the bone usedin its manufacture. It may be safe to say that it usuallycontains from 1 to 3 per cent of nitrogen. It also containsfrom 15 to 18 per cent of phosphoric acid, the majorportion of which is soluble in water. (See Fig. 20.) 351. Dissolved bone-black. — The waste bone-blackfrom sugar refineries, and the highly carbonized boneresidues from annealing processes, yield, upon treatmentwith sulfuric acid, a superphosphate similar to that frombone, excepting for the fact that it contains little or nonitrogen. Towards the close of the preceding century acid phos-phate began to gradually replace dissolved bone-black,but still the prejudice of many farmers was so strongagainst any fertilizer made from rock that acid phos-phate was dyed black, in some cases, in order that it MANUFACTURED PHOSPHATES 207.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfertili, bookyear1913
