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)
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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