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Southern Wisconsin Cheesemakers' and Dairymen's Association / Proceedings of the tenth annual meeting of the Southern Wisconsin Cheesemakers' and Dairymen's Association held at Monroe, Wisconsin, Thurs. and Fri., January 27 and 28, 1910

Readheimer, J. E.
Phosphorus as a fertilizer on the dairy farm,   pp. 75-83 PDF (1.9 MB)

Page 79

made available by the same means. \nd manure is the
very best kind of organic  matter to  use as it readily
decays in the soil.  Raw  rock phosphate is not only
cheap, but its phosphorus content is highij. It is as rich
in phosphorus as pure steamed bone meal, twice as rich
as acid phosphate, costs only about a third as muclh as
steamed bone meal, and only a fourth as much as acid
Phosphorus has at least three distinct actions on the
crops. It has a indirect action on the grain crops in that
it increases the yield of clover thus providing more humus
and nitrogen in increased amounts of manure. And it exerts
a beneficial action  in making it possible to grow  more
thrifty and v igorous plants to resist the attacks of in-
sect enemies and fungous diseases. It is a well known fact
that insects attack the weakest plants.
Much work has been done with raw rock phosphate
used in connection with decaying organic matter. Probably
the oldest and best known experiments have been conduct-
ed by the Ohio Experiment Station, using manure as the
form of decaying  organic matter.  A n experiment was
begun in 1897 for the purpose of comparing manure that
had been exposed to the weather in an open barnyard dur-
ing the winter with that taken (lirectly fronm the stable to
the field, an(l of studying the effect of treating the manure
with reinforcing materials. Four parcels of manure were
used in the exp)riments, two from  the open vard, alnd two
from the stables. With one parcel of each kind of  manLure
40 pounds of raw rock phosphate were mixed with each
ton of manure, while the other parcels remained untreat-
ed. Eight tons of each kind of each kind of manure were
hauled out and spread on a clover sod that was to be plant-
ed to corn. This was in a three-wear crop rotation of corn,
wheat, and clover. The experiment was carried on on three
fields so all three crops were represented every year. As an
average of 11 corn crops, 10 wheat crops and 7 hay orops the
increases per acre were as follows:

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