Effect of Alkali Salts in Soils on Crops 



39 



Sugar beets Wheat 



Corn Field peas 



Oats 



Barley 



Alfalfa 



Fig. 40. — Curve showing the effect of sodium chlorid, sodium carbonate, and sodium sulphate on the num- 

 ber of days to come up from seeds of various kinds. Average for concentrations from 1,000 to 10,000 

 p. p. m. 



O 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 



Concentration of salts in p. p. m. 

 41. — Curve showing the height of wheat plants germinating in College loam, Greenville loam, and 

 sand with different concentrations. Average of 13 salts. 



