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Updated: June 23, 2025
It cost him only $1 an acre a year in fine-ground natural rock phosphate to produce increased yields of 16 bushels more corn, 23 bushels more oats and 1 ton more clover than the average yields secured without adding phosphorus.
There are three things that mother and I are fully decided upon: First, that we shall use ground limestone in sufficient amounts to make the soil a suitable home for clover. Second, that we shall apply fine-ground rock phosphate in such amounts as to positively enrich our soil in that very deficient element.
Of course we do not need this in order to add to our total stock of potassium, but more especially I think to assist in liberating phosphorus from the raw phosphate which is naturally contained in the soil and which we shall also apply to the soil, unless the Government permits the fertilizer trusts to get such complete control of our great natural phosphate deposits that they make it impossible for farmers to secure the fine-ground rock at a reasonable cost, which ought not, I would say, to be more than one hundred per cent. net profit above the expense of mining, grinding, and transportation.
In Illinois we can get it delivered a hundred miles from the quarry for $1.20 a ton. It costs no more for a thirty-ton car of ground limestone than the farmer receives for a cow; and the cost of a car of fine-ground natural phosphate is about equal to the price of one horse." "Of course, our limestone supplies are essentially inexhaustible," said Mr.
Our experiment station has found that our most extensive soil types are not rich in phosphorus, and has republished for our benefit the reports from the Maryland and Ohio experiment stations showing that the fine-ground natural rock phosphate appears to be the most economical form to be used and that it is likely to prove much more profitable in the long run, although it may not give very marked results the first year or two.
As to phosphorus, it is safe to say that in the long run fine-ground rock phosphate will prove the best investment; but for a few years it might be best to make some use of acid phosphate in addition to the raw rock, at least until you are ready to begin turning under more organic matter with the phosphate.
One of these is the short-sighted plan or policy of the average farmer, and the other is the combined influence of about four-hundred fertilizer manufacturers who prefer to sell, quite naturally, perhaps, two tons of acid phosphate for $30, or four tons of so-called "complete" fertilizer for $70 to $90, rather than to see the farmer buy direct from the phosphate mine one ton of fine-ground raw rock phosphate in which he receives the same amount of phosphorus, at a cost of $7 to $9.
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