10 
Colorado Agricultural Experiment Station 
Irrigation by Flooding .—The general practice of irrigating alfalfa 
by surface flooding, has succeeded well in growing hay, but the ten¬ 
dency is generally towards getting the soil too wet for good results 
for seed production. Where land has been flooded for a number of 
years the soil becomes compacted, and will crack, and dry very rapidly, 
if irrigated it easily becomes too wet, making it next to impossible 
to regulate the moisture conditions suitably for seed production where 
land is flooded. 
No. 4.—A contrast between the root development of alfalfa in a thick stand irrigated 
by surface flooding shown in the left; and plants of the same variety sown the same time 
in rows twenty inches apart, cultivated and irrigated in furrows, as shown in the plants on 
the right. 
Combining Hay and Seed Production .—Experience has shown 
that it is not practical to combine the production of hay and seed from 
the same field, because of the different moisture requirements for each. 
The success of the hay crop almost precludes the chance of the success 
of the other. Yet, there is usually a light growth of hay in connection 
with alfalfa seed growing, as the season in Colorado is not long enough 
to mature two crops of seed in one year. 
AlealEa in Rows eor Seed Production 
Growing alfalfa in rows with intertillage, for seed production, is 
not a new idea, but it is practically new in Colorado. Until the Ex- 
