THE FLOWER GARDEN 321 



eases and the failure of crops is due more to this 

 than to the lack of proper chemical elements. 



It is possible to get resistant varieties of vege- 

 tables, grains, flowers, and trees and the process 

 is the same in all cases. 



Nature practices rotation of crops in the 

 forest. A forest of hardwood trees is almost 

 always replaced by softwood trees. After these 

 have grown on the land for some years, they are 

 replaced by hardwood trees. And so the rotation 

 continues. 



This is not intended to be a complete discus- 

 sion on the rotation of crops. It is the principles 

 which underlie the practice that are of the most 

 fundamental importance. 



It is impossible to suggest any definite kinds 

 of rotations which will be applicable under all 

 conditions. Each person must familiarize him- 

 self as much as possible with the underlying 

 principles and determine the rotation that is 

 needed under his own special conditions. 



The physical condition of the soil 

 in practically every case is more 

 important than the chemical con- 

 dition; that is, it has a more direct 

 effect upon the crops. 



Vol. 7 Bur. K 



