Oct. 4 , 1915 
Effect of Alkali Salts in Soils on Crops 
19 
tionately more toxic than in the other soils. This is exactly the same 
result that was obtained in 1913 in the experiments already described. 
In sand the carbonates seem to be nearly as toxic as the chlorids, while 
in the other soil they are very much less injurious. 
ChecK^ No Salt 
• = One plant . — =0.1 gm. dry matter . 
Fig. 9.—Diagram showing the number of wheat plants up and dry matter produced in 14 days on coarse 
sand with potassium nitrate, magnesium nitrate, and sodium nitrate in different combinations and 
concentrations. 
Oieck^NoSalt 
• = One plant . — =0.1 gm. dry matter . 
Fig. 10.—Diagram showing the number of wheat plants up and dry matter produced in 14 days on coarse 
sand with potassium sulphate, magnesium sulphate, and sodium sulphate in different combinations 
and concentrations. 
Figure 8 shows the* same relationship between the chlorids as was 
brought out in figure 3. It also shows that these salts are in injurious 
lower concentrations in sand than in other soils. 
The nitrates are shown in figure 9 to be slightly less injurious than the 
chlorids in figure 8. The sodium salt is again shown to be more injurious 
than the others. 
