14 



DRY-FARMING 



Pounds of Water for One Pound of Dry .Matter 



It is clear from the above results, obtained in Ger- 

 many, that the amount of water required to produce 

 a pound of dry matter is not the same for all plants, 

 nor is it the same under all conditions for the same 

 plant. In fact, as will be shown in a later chapter, 

 the water requirements of any crop depend upon 

 numerous factors, more or less controllable. The 

 range of the above German results is from 233 to 

 774 pounds, with an average of about 419 pounds 

 of water for each pound of dr}' matter produced. 



During the late eighties and early nineties. King 

 conducted experiments similar to the earlier German 

 experiments, to determine the water requirements of 

 crops under Wisconsin conditions. A summary of 



