EFFECT OF SULFATE OF AMMONIA ON SOIL. 



79 



Table V. — Milligrams of Sodmm Oxide removed from 100 Grams of Air- 

 dried Soil by Different Solutioits of Ammonium Sidfate. 



Plot. 



L, . 



UL, 



1 L, . 

 1 UL, 

 6 L, . 



6 UL. 



7 L, . 



7 UL, 



8 L, . 

 8 UL, 



Milligrams of Potassium Oxide removed from 100 Grams of Air-dried Soil. 



L, . 



UL, 



1 L, . 

 1 UL, 

 6 L, . 



6 UL, 



7 L, . 



7 UL, 



8 L, . 

 8 UL, 



12.00 

 10.75 

 15.45 

 10.75 

 10.00 

 12.65 

 17.70 

 13.90 

 14.55 

 11.70 



13.60 



27.15 



23.70 

 21.50 



31.25 

 26.85 

 26.20 



20.85 

 27.15 

 23.05 

 24.95 

 21.50 

 28.75 

 29.05 

 25.25 

 22.75 



As with the calcium the sodium and potassimii removed increase with 

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

 calcium 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 amount 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 ammoniiun-sulfate solutions, the large 

 amounts of ammonimn sulfate presented difficulties which interfered with 

 the accurac}' of the detemiinations in every instance. 



