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The Story of the Soil; from the Basis of Absolute Science and Real Life, by Cyril G. (Cyril George) Hopkins
page 243 of 371 (65%)
"If the corn is worth 35 cents a bushel, the wheat 70 cents, and the
hay $6 a ton, in addition to the expense of harvesting and
marketing, then the total value of the manure spread on the land is
$2.07 a ton.

"Where $1.20 worth of raw phosphate (320 pounds) were added in
connection with the manure the average yields were as follows:

61.4 bushels of corn
26.3 bushels of wheat
2.23 tons of hay

"And where $2.40 worth of acid phosphate (320 pounds) were used with
the same amount and kind of manure the following average yields were
secured:

60.4 bushels of corn
26.5 bushels of wheat
2.16 tons of hay

"These are the actual yield, and by any method of computation yet
proposed, each dollar invested in raw phosphate has paid back much
more than has a dollar invested in acid phosphate."

"And was the use of the raw phosphate really profitable?" asked Mr.
West.

"Well, you might figure that out for yourself," Percy replied,
"preferably using the average prices for your own locality for corn,
wheat and clover. As I figure it at prices below the ten-year
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