EFFECT OF SULFATE OF AMMONIA ON SOIL. 



79 



Table X. — • Milligrams of Sodium Oxide removed from 100 Grams of Air- 

 dried Soil by Different Solutions of Ammonium Sidfate. 



Plot. 



N/10 Solution. 



N Solution. 



2H N Solution. 



L, . 



UL, 



1 L, . 

 1 UL, 

 6 L, . 



6 UL, 



7 L, . 



7 UL, 



8 L, . 

 8 UL, 



13.25 

 11.40 

 14.05 

 13.50 

 7.95 

 9.80 

 9.55 

 10.10 

 8.75 

 8.20 



32.60 



20.40 



20.40 

 17.75 



19.90 

 18.30 

 19.90 



25.45 

 23.05 

 22.55 

 21.20 

 18.85 

 22.00 

 24.40 

 22.00 

 18.75 



As with the calcium the sodium and potassium removed increase with 

 the concentration of the ammonimn-sulfate solutions used. Unlike the 

 calcimn there are no marked differences in the amounts removed from the 

 limed and unlimed ends of the plots, or from the different plots. This 

 would seem to indicate that the continued use of ammonium sulfate has 

 not diminished the amomit of sodium and potassium in the soils, or, stated 

 differently, the absence of lime has not increased the rate at which they 

 were removed from the soils. 



In determining the acids in the ammonium-sulfate solutions, the large 

 amomits of ammonium sulfate presented difficulties which interfered with 

 the accuracy of the determinations in every instance. 



