Bulletin 258 
February, 1921 
The Agricultural Experiment Station 
OF THE 
Colorado Agricultural College 
THE FIXATION OF 
NITROGEN IN COLORADO SOILS 
A Study of the Wellington District, 
Larimer County, Colorado 
By 
Wm. P. HEADDEN 
PUBLISHED BY THE EXPERIMENT STATION 
FORT COLLINS, COLORADO 
19 2 1 
