EFFECT OF SULFATE OF AMMONIA ON SOIL. 



77 



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



of Dye Solution. 



The table shows that the unhmed 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 unhmed 

 ends the differences are smaller. 



The d3^es 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 limed end of plot 1, from which 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 bj'' the titration method with potassium 

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

 are showTi in Table IV. 



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

 dried Soil by Distilled Water and by Different Solutions of Ammonium 

 Sidfate. 



