riiE Colorado Experiment vStation 
o 
o . 
Fig-. 16. Photographs of two alfalfa fields less than ten rods apart. Note 
the dandelions in the upper apparently crowding out the alfalfa, while in the 
lower none appear. The fields have been seeded about the same length of time, 
but the first has been injured by trampling and in other ways the alfalfa has 
been killed out, allowing the weeds to enter 
