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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
(1910)

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


Page 80


TENTII ANNUAL CONVENTION
Yard manure, untreated, gave an increase of 16.8 bu. of
corn. 8.,> bu. wheat, .32 tons hav.
Stall manure, untreated, gave an increase of 23.1 bu corn,
9.9 hu. wheat, *d) tons hay.
Yard manure an(l rock phospllate gave an increase of 23.1
b1. corn, 13.1 l)u. wheat, .75) tons hay.
Stall manure and rock phosphate gave an increase of 29.4
bu. corn, 15.2 bu. wheat, 1.16 tons hay.
Reducing this to money values, counting corn at 3,
cents per bushel, wheat at 70 cents per bushel, and hay at
$601) per ton the increases amount to the following sums:
Yard mauure, untreated                       $13.74
Stall manure, untreate(l                       18.61
Yard manure an(l rock phosphate               21.70
Stall manure and rock phosphate                27.89
Comparing the yard and stall manure it is seen that
each ton of vard minure gave a value in increased crop yields
of $1.72 while the stall manure gave a value of $2.33. A ton
tuf yard manure treate(l with 40 poun(ls of raw rock phosl)hate
gavl  a return of S2.72, while a toil of stall manure treated
40 pOll(s of raw rock phosl)llate gave an increase of $3.49.
The 40 potun(ls of raw rock phosphate was figured at 17A
cents, Then by usin-  l7,  cents worth of raw rock phosphate
in connection with a ton of yard manure the value was in-
cre.Lse(d $l.0ol, or for everv dollar invested in raw rock
plhosaphate and use(d in this way, $5.71 were returned in in-
creased crop yields, a clear profit of $4.71. Where the rock
pllosl)hate was use(l with stall manure each dollar returned
an increase of 16.03, a clear profit of $,).63.
Long continued experiments with the use of raw rock
pllosphllate have been reported by the Maryland Experiment
Station, the Pennsylvania Experiment Station, the Massa-
chusetts, and a number of others. The results have uniform-
ly been satisfactory where the supply of decaying organic
matter in the soil has been maintained. Illinois has (lone an
immense amount of work in the use of phosphorus. On the
University farm at Urbana the use of pure steamed bone meal


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