The Dandelion in Colorado 
35 
labor costs are considerered, is by spraying with the iron sulphate 
solution. 
(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¬ 
sible, the limiting cause. In most cases a proper system of crop 
rotation should be employed, which involves a period of culti¬ 
vation. 
