July I, 1920 



Universality of Field Heterogeneity 



297 



Combining yields in a 2 by i fold manner, we find for the correlation 

 between the yields of adjacent Vio-^-cre plots 



For 1895, r= +0.830 ±0.019, ^/■£^r = 43-4- 

 Fori896,r=+ .8i5± .021, f/Er= 39.6. 

 For 1897, r=+ .6o6± .039 r/Er= 15.5. 



It is evident that the field was rather highly heterogeneous. 



Fig. 8. — Diagram showing yield of car com, 1915, 

 expressed in pounds per quarter plot. 



on the Huntle/ experimental tract. The \'itJd is 



