UTAH ACADEMY OF SCIENCES 153 
THE ALKALI CONTENT OF CERTAIN UTAH SOILS. 
By F. S. HARRIS. 
(Summary). 
Alkali determinations were made in soil from. seven 
counties in Utah. Samples were taken from typical alkali 
spots, from parts of the same field producing good crops, 
and from places surrounding the bare spots where only 
about a half crop was produced. 
Determinations were made of total soluble salts, chlo- 
rides, carbonates, and sulphates in these soils to a depth of 
four feet. 
Curves were given showing the distribution of the dif- 
ferent salts at various depths in each soil. 
The highest concentration and the location of salts was 
found to vary considerably; in some soils it was found in 
the surface foot, while in others it was two, three, or four 
feet below the surface. 
Taking an average of all seven counties, good crops 
grew where there were 5,089 parts per million total soluble 
salts, but no crops grew where there were 14,397 parts per 
million of salts. There was about half a crop where the 
total salts were 9,263 p. p. m. 
As an average of the three counties where sulphates 
were low, no crops were produced with a concentration of 
10,709 p. p. m. of salts, while there was only half a crop 
with 6,455 p. p. m. 
A study of the individual curves shows just about the 
toxic limit of alkali salts under field conditions where the 
salts indicated are present. 
