DRY-FARMING 



fall, and evaporation. With regard to 

 the first it may be stated that wheat and 

 oats will stand a much lower temperature 

 than corn (maize) or sorghum. Again, 

 some regions are found in which the tem- 

 perature is so high that wheat does not 

 thrive. For this reason only those plants 

 should be selected which are well adapted 

 to the temperature range of the particu- 

 lar region in which they are to be grown. 

 'Now in dry-land farming the most im- 

 portant problem is naturally the amount 

 and distribution of the rainfall. The 

 rain falling in the course of a year is 

 usually measured in the form of inches. 

 This amount ranges all the way from 

 nothing or a mere fraction of an inch, as 

 in portions of the Andes and the great 

 African and Asian deserts, to as much 

 as 600 inches, or fifty feet, at Cherapun- 

 dji in eastern India. In studying a 

 rainfall map of the world it will be seen 

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