Colorado Experiment Station 
j8 
Types of the Rural variety, a standard late variety. Widely grown in 
many districts of the State 
The two Standard varieties grown are the Pearl and the Rural. 
The Pearl leads to the extent of 75 percent of the total planting, 
though many growers are beginning to plant the Rural more 
extensively. The Pearl variety out-yields all others, and seems 
to be particularly adapted to the soil and climatic conditions 
obtaining in the district. 
District No. 2, comprising what is known as the rain belt of 
the Eastern Slope, occupies the central elevated portion of the 
Eastern Slope from the mountains towards the plains. Little or 
no irrigation is practiced in this section, the rainfall being from 
14 to 20 inches, and fairly well distributed. The altitude varies 
from 5,500 to 7,000 feet.. The fact that potatoes are grown without 
irrigation makes it necessary that the crop mature early in order 
that it may not be damaged by the late summer drought. Early 
maturing varieties are mostly planted, and these have proven a 
success. The Early Chios, the Chicago Market, and Six Weeks 
are most extensively planted. Early Chios being the leading 
variety. In the sections where the rainfall reaches 18 to 20 inches, 
the Pearl variety is grown with success. 
District No. 3, the Northwestern district, is characterized by 
a short season, due to its high elevation and cool nights. Late 
maturing varieties should not be planted. Russet Burbank, Early 
Chios, and the Rural are leading varieties. 
In District No. 4, which is the Intermountain district, the soil 
is medium heavy and admirably adapted for the growing o f high 
