Water Required for a Pound of Dry Matter 19 



Fig. 1. Method used to measure the amount of water required to produce 

 a pound of dry matter. 



tions of the cylinders than could have occurred in the correspond- 

 ing depths in the field soil. Just how these differences of tem- 

 perature conditions have modified the results we are not yet in a 

 position to say, but it is not likely that they have caused very 



