EFFECT OF SULFATE OF AMMONIA ON SOIL. 



77 



Table III. — Dye absorbed by 10 Grams of Soil from 100 Cubic Centimeters 



of Dye Solution. 



Plot. 



Aniline Blue 



(50 Parts 

 per Million). 



Aniline Blue 



(100 Parts 

 per Million). 



Aniline Green 



(100 Parts 

 per Million). 



L, . 



UL, 



1 L, . 

 1 UL. 

 6 L, . 



6 UL, 



7 L, . 



7 UL, 



8 L, . 

 8 UL, 



49.68 

 49.71 



49.76 

 49.73 

 49.33 

 49.74 

 49.69 

 49.73 



98.45 

 98.50 

 99.12 

 98.94 

 98.58 

 93.54 

 98.40 

 98.24 

 98.61 

 97.76 



97.00 

 95.00 

 96.67 

 95.97 

 95.30 

 87.50 

 96.00 

 94.75 

 94.50 

 92.00 



The table shows that the unUmed ends of plots 6 and 8 absorb a little 

 less dye than do the hmed ends or the other unlimed ends. While the 

 other plots also show a higher absorption in the limed than in the unlimed 

 ends the differences are smaller. 



The dyes seem to have a deflocculating effect on the clay in the soil, as 

 they settle much more slowly than with a corresponding water treatment. 

 This is particularly noticeable on the hmed end of plot 1, from wliich the 

 solution, even at the end of twenty-four hours, was too turbid to be used 

 in a colorimeter. 



Calcium Oxide removed. '' 



Calcium oxide was determined by the titration method with potassium 

 permanganate. The amounts removed from 100 grams of air-dried soil 

 are shown in Table IV. 



Table IV. — Milligrams of Calcium Oxide removed from 100 Grams Air- 

 dried Soil by Distilled Water and by Different Solutions of Ammonium 

 Sulfate. 



