CHAPTER IV 



RAINFALL AND EVAPORATION 



THE agricultural productivity of 

 any region is primarily governed 

 by the nature of the climate and the 

 quality of the soil. For example, the 

 rainfall may be so scant or the growing 

 season so short, or frosts so frequent as 

 to make farming even on fertile land 

 more or less impracticable. On the other 

 hand, no matter how favorable the climate 

 may be, if the soil is so compact as to 

 retard the free movement of air, and 

 water; or if it lacks one or more of the 

 essential elements of plant-food, crops 

 cannot be successfully grown. Now the 

 climatic factors which are involved in 

 crop production are temperature, rain- 

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