• 11 </ 'J p 
i .1. 
Bulletin 2 3 1 
Odober, 1917 
The Agricultural Experiment Station 
OF THE 
Colorado Agricultural College 
“BLACK ALKALI" IN THE SAN LUIS 
VALLEY 
By 
WM. P. HEADDEN 
PUBLISHED BY THE EXPERIMENT STATION 
FORT COLLINS, COLORADO 
1917 
