Bulletin 160 
May, 1910 
The Agricultural Experiment Station 
OF THE 
Colorado Agricultural College 
> < 
NITRATES IN THE SOIL 
An Explanation of so-called “Black Alkali” or “Brown Spots” 
BY 
WM. P. HEADDEN 
PUBLISHED BY THE EXPERIMENT STATION 
FORT COLLINS, COLORADO 
1910 
