IN THE SOIL 



33 



Mean volume of water held by different soils, in laboratory tests in columns Ifi inches 

 high, with calculations to field conditions (Lyon and Fippin) 



1 Estimated. 



Water taken from the soil by evaporation is a loss additional to that 

 transpired by the crop. The following results were secured at the 

 Iowa Experiment Station in an experiment to determine the total 

 amount of water removed from the soil by evaporation and tran- 

 spiration : 



One inch of water covering an acre of land weighs about 226,875 

 pounds, or more than 113 tons. 



Water evaporated by growing plants for one part of dry matter produced, in 

 pounds (Lyon and Fippin) 



