CROPPING SYSTEMS, FERTILIZERS FOR CORN 229 



fertilizer will maintain the normal soils of the C9tton-belt 

 at a high level of productiveness. 



(3) Nitrogen is too expensive to purchase in commercial 

 fertilizers to supply the entire needs of the corn crop. It 

 should be supplied by growing legumes and applying 

 barnyard manure. 



(4) It seldom pays to use fertilizers, (a) where corn is 

 grown continuously; (b) on land that is deficient in organic 

 matter; (c) on land that has been poorly prepared. Under 

 such conditions a relatively small percentage of the fer- 

 tilizer is used by the crop. 



