1915.1 



PUBLIC DOCOIEXT — Xo. 31. 



39 a 



Sulfate of Ammo^'ia v. Xitrate of Soda as a Top-deess- 

 ixG foe Peemaxext Mowixgs. 

 This field has been continuously in grass since 1899. In 

 1908 the present plots were laid off, with an idea of studying 

 the relative value of sulfate of ammonia and nitrate of soda as 

 a top-dressing for grass. The materials are used in such quan- 

 tities as to supply equal nitrogen to each plot. There is a check 

 plot which receives an application of : — 



Pounds per 

 Acre. 



Bone meal, 400 



Muriate of jjotash, 180 



Basic slag, 400 



The sulfate of ammonia and the nitrate plots also receive 

 this mixture. The sulfate of ammonia has been used at the 

 rate of about 175 pounds per acre, and the nitrate of soda at 

 about 233^ pounds per acre. The following table shows the 

 increased yield' per acre due to the use of the two chemicals for 

 each year since the experiment started : — 



From the above table it will be apparent that the nitrate of 

 soda has this year produced the greater increase. This is true 

 in four out of the seven years, and' the net excess of the nitrate 

 plot over the sulfate plot for the seven years is 592 pounds per 

 acre. 



