FACTORS AFFECTING CULTURE OF CROPS 3 



given in the following diagram, together with the yield in millions 

 of tons: 



World's Crops of the Most Important Food Plants. Average for 5 Years, 



1906-1910 z 



While the world's production of potatoes outranks all others in 

 total yield, the wheat crop has the greatest money value, with pota- 

 toes and corn probably ranking second and third. In the United 

 States, corn is more valuable than any other two crops, as shown by 

 the following diagram : 



Relative Farm Value of Principal Crops in the United States. Average for 

 5 Years, 1906-19 10 3 



Factors Affecting Culture of Crops. While favorable weather 

 and soil are necessary for the culture of a certain crop, yet when 

 both of these conditions are favorable, the crop is often not culti- 

 vated. Market demands, transportation facilities, and competing 

 crops must all be considered. For example, the southern states have 



a From " Corn Crops," by the author, The Macmillan Company. 

 Ibid. 



