FEEDING THE PLANT 



105 



Still, the results, broadly interpreted, show that 

 with the exception of limited areas of special character, 

 the lands of the east and south, which have been culti- 

 vated for a long time, are benefited by the addition of 

 fertilizers, and in most instances all the constituents 

 are required. This is a safe assumption, where no 

 specific information derived from experiments is avail- 

 able, because we have not yet attained maximum yields 



Fig 28— Modern Corn Crib 



At Minnesota experiment station 



in these states under natural conditions. The experi- 

 ments also show that it is a question of applied plant 

 food, not only, but also of its systematic and intelligent 

 use. The "hit or miss" system in the application of 

 fertilizers or manures is not a good one. 



Classification of Crops — It has also been clearly 

 demonstrated, in addition, that there is a proper rela- 

 tion between the cost of the material applied and the 



