ALKALI SSLTS 



393 



PERCENTAGE COMPOSITION OF ALKALI SALTS IN SOILS 



1 Headden, W. P. The Fixation of Nitrogen. Colorado 

 Agr. Exp. Sta., Bui. 155, p. 10. 1910. 



2 Hilgard, E. W. Soils, p. 442. New York, 1906. 



3 Dorsey, C. W. Alkali Soils of the United States. U. S. 

 D. A., Bur. Soils, Bui. 35, p. 79. 1906. 



4 Ibid., p. 103. 5 Ibid. t p. 109. 



