Bulletin 186 
May, 1913 
The Agricultural Experiment Station 
OF THE 
Colorado Agricultural College 
The Fixation of Nitrogen in Colorado Soils 
THE DISTRIBUTION OF THE NITRATES AND THEIR 
RELATION TO THE ALKALIS 
Bp WM. P. HEADDEN 
PUBLISHED BY THE EXPERIMENT STATION 
FORT COLLINS, COLORADO 
1913 
