32 
Colorado Experiment Station 
1 
Pig-. 23 — Growth made on Plot IV 
from July 20th to August 20th, 1918. 
A and A are the points at which the 
old plants were cut off. G. D. is the 
ground line. The growth was made 
after the severe treatment outlined in 
text. 
Plot V. Grubbing Along Ditch Banks. — This plot is located 
a quarter of a mile east of Cortez, on the Cortez lateral. The 
ground which was infested with milkweed extends along the ditch 
bank for 50 feet and averages 8 feet in width. The milkweed ex- 
tended to the water’s edge for the full distance. The soil is the 
heavy, red clay loam, characteristic of the Montezuma Valley, 
free from rocks and easily worked. The ground was solidly cov- 
ered with the milkweed at the beginning of the experiment, no 
other weeds being present. Work was begun at the time the plants 
were just beginning to form pods, on July 15, 1918. The same 
method was followed as in Plot III; that is, a trench 8 or 10 in- 
