oct. 4, 1915 Effect of Alkali Salts in Soils on Crops 23 
planted in each glass. The crops compared were wheat ( Triticum spp.), 
barley (Hordeum spp.), oats (Avena saliva), com ( Zea mays), alfalfa 
(Medicago saliva ), sugar beets {Beta vulgaris ), and Canada field peas 
{Pisum arvense). The results for wheat have already been shown in 
Na Cl 
Check^)No Salt 
Fig. 17.—Diagram showing the number of barley plants up and dry matter produced in 24 days on Green¬ 
ville loam with sodium sulphate, sodium carbonate, and sodium chlorid in different combinations and 
concentrations. 
Check® No Salt 
eoooppm. 7,000 ppm. 6.000 ppm. 9.000 ppm.. 10,000 ppm: 
» = One plant. — = 0.1 gm . dry matter. 
Fig. 18.—Diagram showing the number of corn plants up and dry matter produced in 21 days on Green¬ 
ville loam with sodium sulphate, sodium carbonate, and sodium chlorid in different combinations and 
concentrations. 
figure 2, while those for the other crops will be found in figures 17, 18, 
19, 20, 21, and 22. 
An examination of these diagrams shows that the relation between the 
salts, pointed out in connection with wheat, holds for the other crops. 
According to the resistance of their seedlings to alkali, the crops fall 
into the following order: (1) Barley, (2) oats, (3) com, (4) wheat, (5) 
