Effect of Alkali Salts in Soils on Crops 



along the sides contained a mixture of two salts, while the glasses in the 

 center contained all three salts in the proportions indicated. 



It will be noted that the top glass (O) contained loo per cent of sodium 

 chlorid, the second row, with glasses M and N, 75 per cent of sodium 

 chlorid, the third row, with glasses J, K, and L, 50 per cent of sodium 

 chlorid, the fourth row, with glasses F, G, H, and I, 25 per cent of sodium 

 chlorid, while the bottom row contained no sodium chlorid. The same 

 order is followed with each of the other salts. Thus, there are glasses 

 with each of the single salts, others with two salts in various combina- 

 tions, and still others with all three salts in different proportions. From 

 this arrangement it is possible to determine the effects of the single 

 salts as well as the various combinations of salts. 



In order to find the effects of the concentration of salts, 10 different 

 concentrations were tried for each three salts. These varied from 1,000 

 to 10,000 p. p. m. of salt based on the dry soil. The combination of salts, 

 as well as the soils and crops, are given in Table VIII. 



Table VIII. — Combinations of salts, soils, and crops used in concentration experiments 



« The ammonium carbonate used has the formula (NH4)sC03(NH<)!C0jNH2, but the simpler formula. 

 (NH4)K^03, is used for convenience. 



