102 FORAGE CROPS 
Fig. 19. Yellow milo maize, 
one of the doura yroup. 
45 pounds of nitrogen, 
20 pounds of phosphorie acid, and 
50 pounds of potash. 
This is 10 per cent more nitrogen, 
30 per cent more phosphoric acid 
and over 100 per cent more potash 
removed by the special crops than 
by the corn. The land, therefore, is 
more rapidly and completely de- 
pleted of its available plant-food by 
these summer-grown plants; and 
this accounts for the fact that 
they cannot be successfully 
grown on poor soils, and that 
subsequent crops, that have 
apparently less ability to ap- 
propriate plant-food, cannot 
be successfully grown without 
liberal manuring or fertilizing. 
These characteristics should 
be always taken into con- 
sideration when substituting 
this class of crops for corn in 
forage crop rotations. 
KAFIR CORN FOR DRY REGIONS 
It has been said that the 
non-saccharine sorghums are 
