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Updated: July 25, 2025
In the manufacture of acidulated fertilizers, one ton of raw phosphate, containing about two hundred and fifty pounds of the element phosphorus, is mixed with one ton of sulfuric acid to make two tons of acid phosphate; and, as a rule, these two tons of acid phosphate are mixed with two tons of filler to make four tons of complete fertilizer.
Water had trickled through it, and that water being probably charged with a superfluity of carbonic acid, had dissolved all the phosphate and carbonate of lime, and the bones themselves had thus decayed and entirely disappeared; but as the sandstone happened to have consolidated by that time, the precise shape of the bones was retained.
If, however, you ever wish to use raw rock phosphate, insist upon its being sufficiently fine-ground that at least ninety per cent. of it will pass through a sieve with ten thousand meshes to the square inch, this being no finer than is required for the basic slag phosphate, of which several million tons are now being used each year in the European countries.
If the growers would make use of basic slag, superphosphate, or bone dust to replace the phosphate of lime removed by the crop, and of potash in one of its available forms, they would soon experience a great improvement in the power of their asparagus to resist disease and deterioration.
For that reason I shall take an early opportunity to send a special message to Congress on the subject of the improvement of our waterways, upon the reclamation and irrigation of arid, semiarid, and swamp lands; upon the preservation of our forests and the reforesting of suitable areas; upon the reclassification of the public domain with a view of separating from agricultural settlement mineral, coal, and phosphate lands and sites belonging to the Government bordering on streams suitable for the utilization of water power.
This and very similar investigations in progress lead us to believe that rock phosphate is a cheap and effective source of phosphorus where immediate returns are not required.
"My worthy Ned," I answered, "to the poet, a pearl is a tear of the sea; to the Orientals, it is a drop of dew solidified; to the ladies, it is a jewel of an oblong shape, of a brilliancy of mother-of-pearl substance, which they wear on their fingers, their necks, or their ears; for the chemist it is a mixture of phosphate and carbonate of lime, with a little gelatine; and lastly, for naturalists, it is simply a morbid secretion of the organ that produces the mother-of-pearl amongst certain bivalves."
"Now, to apply five tons per acre on two hundred and forty acres will require one thousand two hundred tons and that will cost us $1,570 in cash, less perhaps the $70, which we save on roads and the untreated check strips which I want to leave. To apply one ton of phosphate per acre to the same six fields will cost about $1,600.
I did expect to be, but that acid phosphate seemed to have been the very thing for me, and I thank you heartily for suggesting it to me." "Perhaps you had better take another dose before retiring. You may need some, too, through the night; so you may take the bottle to the cabin with you," and he got it and placed it in her hand.
Better than Florida or Tennessee." My eyes instinctively turned to where they had last seen the launch; of course it wasn't there any more. Then I spoke to David. "Do you know what a phosphate bed looks like? Can one see it?" "This kind you can," he answered. "But it's not worth your trouble. Just a kind of a square hole you dig along the river till you strike the stuff.
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