4 
('OLOKADO ExTEKniENT STATION 
wlii(‘]i is to 1)6 planted to potatoes the following year is plowed 
shallow, or ‘'crowned,” late in the fall. In the spring the soil is 
pnlveri/ed by harrowing as early as moisture conditions will permit. 
In A])ril or the first of May, the land is manured and plowed to a 
depth of eight or nine inches after which it is harrowed and leveled. 
Practically all the potatoes used for seed are treated before 
planting, using a solution of corrosive sublimate containing one 
pound of the chemical to 120 gallons of water. Planting is started 
from the first to the fifth of June, the two-man type of planter being 
used for the machine work. Cultivation is begun as soon as plant- 
ing is finished and continued until the vines become too large for 
further operations with the cultivator. With the exception of 
special irrigation experiments and a few non-irrigated rows the 
potatoes are irrigated at such times as their appearance and the 
condition of the soil would indicate that water was needed, the 
time for starting and the frequency of application depending upon 
climatic conditions. On the experimental plats the water is dis- 
tributed by means of wooden tubes having an orifice of one inch in 
diameter which are placed in the ditch bank, one tube to each 
roAv. This system greatly facilitates the uniform application of 
Avater Avhich is essential for accurate exper’mental Avork. 
Fig. 1 — Irrigation system used on experimental plats, showing tubes placed in ditch bank 
to secure a uniform, distribution of water. 
