The Potato Industry oe Colorado. 35 
trolled by air pressure from the air brake system would be prefer- 
able.t 
4 
Danger Dates .—Corn growers and even beet raisers have more 
time to complete their work in the fall than has the potato farmer, 
because they are more independent of frost. 
The experience of years has established dates past which it is 
dangerous to leave potatoes in the ground subject to heavy frost 
losses. Waiting for potatoes to ripen is not wise; it is better to 
devise ways to ripen them earlier another season and save what is 
in hand this time. 
At 7,000 to 8,000 feet altitude, October 1st is the danger line. 
PivATE IX.—The Kersey Ditcher 
At Greeley, the leases used to read Oct. 20th, but growers feel 
safer to be done several days sooner, as damage has occurred on 
the 16th. Lower still, about Julesburg, for instance, Oct. 20th is 
quite safe. 
Old growers recognize these limits of safety. New ones will 
do well to adopt them. 
CARING FOR FROSTED POTATOES. 
When to Sort Them .—The third week after storing is the time 
JThe cost of equipping cars in this way is not more than $100 each. 
Colorado people stopping at at least one hotel in Denver will find this 
system in use in all rooms, and very quick to respond to a five degree 
change in the dial. The Burlington Railway is experimenting with a 
system of this sort, and the Colorado Agricultural Experiment Station, 
funds permitting, will gladly co-operate with the growers, dealers, and 
railroads in working out a system to do away with frost losses in ship¬ 
ment. A system of this kind would be particularly useful between the 
San Luis Valley and Pueblo. 
