298 



Journal of Agricultural Research 



Vol. XIX, No. 7 



For a second test of the influence of field heterogeneity on the yield 

 of ear corn we turn to the Huntley data. 



Fig. 9.~Diagram showing yield of ear corn, 1916, on the Huntley experimental tract. The yield is 

 expressed in pounds per quarter plot. 



In 191 5 and 191 6 corn was grown on the Huntley experimental plots, 

 described above, and was harvested in quarter plots. The yields for 

 the two series are shown in figure 8 for 191 5 and in figure 9 for 191 6. These 

 records are of special interest in view of the fact that these are irrigated 



