A Graphic SiOmmary of Amerwcm AgHcuJture. 



27 



Fig. 21. — The eastern half of the United States produced in 1919 about 86 per cent 

 of the value of all crops of the Nation ; the value of the crops produced in the Cotton 

 Belt and the Corn Belt being nearly 50 per cent The value of the crops iier tiqtiare 

 mile of land area was about .?15,000 in the Corn Belt and .1:8,700 in the Cotton Belt, 

 descending to only .$673 in the Arizona-California Desert Region ; but the value p«r acre 

 in crops was highest in the Arizona-California Desert ($95), where all crops are 

 irrigated, and lowest in the Great Plains Region ($21), where most of the crops are 

 grown under semiarid conditions. 



