The Dandelion in Colorado 
35 
labor costs are considerered, is by spraying with the iron sulphate 
solution. 1 
(g) The dandelion cannot crowd out alfalfa where the latter 
is growing under favorable conditions, and under proper manage¬ 
ment, as shown by fields which successfully resist the encroach¬ 
ments of this weed. Where this appears to be the case, a careful 
study of conditions should be made in order to find out, if pos- 
sm e, the limiting cause. In most cases a proper system of crop 
rotation should be employed, which involves a period of culti- 
vation. 
