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 sativa), sugar beets {Beta vulgaris), and Canada field peas 

 {Pisum arvense). The results for wheat have already been shown in 



s.oooppny. 

 Checkf^NoSalt 



4.oooppm. 



sjoooppm. 



j.oooppm &oooppm 



- = 0.1 gm. dry matter. 



s.oooppm. 



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. 



(''"*)'^°'loooppm.'''*'^'^* Zfiooppm. zoooppm. A.oooppm. 



ChecK^NoSalt 



Sflooppm. 



Mooppm. loooppm. s.oooppm. 9.oooppm. K.oooppm. 



. = 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 wll 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: (i) Barley, (2) oats, (3) com, (4) wheat, (5) 



