FOE AGE CROPS 



45 pounds of nitrogen, 



20 pounds of phosphoric 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 



Fig. 19. Yellow milo maize, 

 one of the doura group. 



It has been said that the 

 non- saccharine sorghums are 



