THE ROTHAMSTED EXPERIMENTS 



375 



tant data relating to wheat yields at Rothamsted is given in Table 



64: 



TABLE 64. WHEAT YIELDS AT ROTHAMSTED 



Wheat, Bushels per Acre, Averages 



1 Average of 15 crops. 2 Average of 13 crops (1852-1864). 

 3 Average of 3 crops (1855, '59, '63). 



In Table 64, the average wheat yields from the plots indicated 

 are grouped in two ways. First are given the averages of all years 

 for those plots or twin plots (on Hoos field) which furnish a con- 

 tinuous record; and, second, the averages are given only for those 

 years when wheat was grown on Agdell field. 



