34 
Colorado Experiment Station 
Plot VI. Late Summer and Fall Plowing. — This plot is located 
on the ranch of Mr. M. W. Milligan, 12 miles southwest of Cortez. 
Mr. Milligan did all the work under the direction of the Experi- 
Fig-, 25 — Method of grubbing in small patches. Note 
bank to be worked to, 
ment Station. This plot was located in an abandoned field on red 
clay loam. On August 1 it was plowed thoroughly to a depth of 
5 inches. On August 26, about 3 per cent, was showing through 
the surface, and a larger percentage was beginning to grow below 
the surface. The plants which were growing came either from 
stems that were not cut off or from solid ground below the fur- 
row slice. The plot was again plowed September 2 to about 6 
inches in depth and allowed to lie over winter. During the 1919 
season about 10 per cent, of the milkweed came back. Practical- 
ly all that came up was in the dead furrow where the roots were 
left exposed. The plot was thoroughly shaded with a stand of 
wild sunflowers, which seemed to hold the milkweed in check. 
Fig. 26 is a picture taken of the plot in late June, 1919. In 1918 
this patch was solidly covered with milkweed. The shading of 
the sunflowers shown had much to do with keeping the milkweed 
in check. 
RESULTS OF WORK DONE BY FARMERS 
All over the State where the milkweed exists, farmers ha\’e 
experienced a great deal of difficulty in making any headway to- 
ward eradication of the plant. The most common method tried by 
farm owners has been to cut the plant off a number of times dur- 
