Other trustworthy experiments by the Maryland and Ohio Experiment
Stations confirm the Pennsylvania results in showing better crop
yields when unburned lime carbonate was used; and more extensive
experiments by the Tennessee Experiment Station also agree with the
Pennsylvania data in regard to the destruction of organic matter and
loss of soil nitrogen from the use of burned lime. If dolomitic
limestone is used, magnesium as well as calcium is thus added to
the soil.
For five million dollars we export to Europe each year enough
phosphorus for 1,400,000,000 bushels of wheat, or twice the average
crop of the entire United States. Meanwhile our ten-year-average
yield of wheat is 14 bushels an acre, while Germany's yield has gone
up to 29, Great Britain's to 33, England's to 37-1/2 and Denmark's
to more than 40 as the average for a decade.
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