126 



THE CEREALS IN AMERI'^A 



This does not, however, represent Europe's total bread require 

 ment, as jarge quantities of rye bread are used by the inhabitants 

 of several European countries. 



i88. Yield per Acre. — There is a marked variation in yield 

 per acre of wheat in different countries. It will be seen that the 

 two countries which produce the most wheat ha\e the smallest 

 yield per acre. 



Average yield of wheat in bushels per acre, 1894-1900: 



Climate apparently has a greater influence in bringing about 

 these differences in yield than either soil or cultural methods, 

 although the latter are important factors. A moderately cool 

 climate with a liberal supply of moisture prolongs the period 

 during w^hich the grain develops, thus favoring the development 

 of the endosperm and thereby increasing the volume weight and 

 the yield per acre. (74, 112) 



189. Export of Wheat and Flour. — The world's export of 

 wheat and flour for the half decade 1898-1902 ranged from 347 

 million (1900) to 444 million (1902) with an average annual 

 exportation of 411 million bushels. During the same period the 

 exportation of wheat and flour from the United States was 

 equivalent to 215 million bushels of wheat per annum, as com- 

 pared with 155 million bushels the preceding five years, which 

 was thirty-six and thirty-four per cent respecti\ely of the total 

 production. The following table is an estimate of the world's 

 average annual export of wheat and flour for the five years 1898- 

 1902 : ^ 



» U. S. Dept. of Agr. Yearbook, 1902, p. jj^. 



