414 
Journal of Agricultural Research 
Vol. VII, No. 9 
absorption of potash and phosphoric acid is in evidence even in con¬ 
centrations of sodium carbonate as low as 100 p. p. m. It is evident 
Fig. 6.—Graphs showing the effect of sodium chlorid on the absorption of nutrients by wheat seedlings. 
Fig. 7.—Graphs showing the effect of sodium sulphate on the absorption of nutrients by wheat seedlings. 
from these measurements that the presence of sodium carbonate, even 
in these minute amounts, may have a markedly deleterious effect upon 
the metabolism of the small-grain crops. 
