EXPERIMENT STATION BULLETINS. 



365 



of straw or a profit of |12.36 per acre above the cost of the fertilizing 

 materials. When acid phosphate was used in combination with sodium 

 nitrate (100 lbs. per acre) and potash as the muriate, at the rate of 

 100 pounds per acre per rotation an average increase of 11.97 bushels 

 of grain and 964 pounds of straw resulted. After deducting the cost of 

 materials a return of |4.50 was obtained. 



Figure 12 — Complete fertilizers are profitable on the farm of M. A. Rowerby, Irving. No. 1, acid 

 phosphate; No. 2, acid phosphate and nitrate of .soda; No. 3, the same as No. 2, plug potash. 



HEAVY SANDY L0AMS_, SILT LOAMS. 



Acid phosphate when used alone op heavy types of soil with rather 

 impervious subsoils has given good returns. 



Fertilizer tests are being conducted on the farm of W. C. Kempster 

 near Coldwater. This soil is a heavy silt loam on a rather heavy clay 

 subsoil. Acid phosphate was applied at the rate of 200 pounds per 

 acre. The increase in yield of oats and wheat, the first two crops of 

 the rotation is as follows : Oats, 5.15 bushels of grain, straw 788 pounds, 

 and wheat 10.15 bushels of grain and 750 ijounds of straw. After de- 

 ducting the cost of the material a profit of |2G.34 per acre remains. 

 On the same soil an application of 2GG pounds per acre of a 2-12-2 com- 

 mercial fertilizer, which adds the same amount of phosphoric acid per acre 

 as the acid phosphate, the increase in grain due to this fertilizer amounted 

 to 12 bushels of oats, G5G pounds of straw, 4.93 bushels of wheat and 

 G30 pounds of straw. The profits above the cost of the fertlizer amounted 

 to 117.83 per acre. 



Similar work is being carried on on the farm of Mr. McCartney near 

 Morrice. The soil is composed of a typical silt loam on a clay subsoil 

 which has been farmed for a long period of years. An application of 

 acid phosphate at the rate of 250 pounds per acre resulted in an increase 

 of 8.G8 bushels of wheat per acre or a return of $12.35 per acre above 

 the cost of the fertilizer. On this same field 250 pounds of acid phos- 

 phate and sodium nitrate (100 pounds per acre) gave an increase of 



