128 MAINE AGRICULTURAL EXPERIMENT STATION. I916. 



Table 8. 

 Yield of Grain, Commercial Varieties. 



Bushels pee Ache. 



1913. 1914. I 1915. Mean 



Early Pearl. . . . 

 Minnesota 26. . . 



Banner 



Gold Rain ..... 



Siberian 



Prosperity 



Irish Victory . . . 

 Imported Scotch 



Kherson 



Swedish Select. . 

 Senator 



Average . . . 



69.7 



93.9 



82.3 



67.7 



94.4 



82.7 



62.7 



94.5 



81.8 



65.2 



90.3 



77.9 



71.1 



83.3 



77.1 



63.0 



92.1 



74.1 



67.0 



82.4 



76.2 



67.7 



87.1 



64.8 



60.8 



82.7 



66.8 



60.9 



79.9 



68.3 



51.7 



83.6 



57,9 



64.3 



85.8 



73.6 



82.0 

 81.6 

 79.7 

 77.8 

 77.2 

 76.4 

 75.2 

 73.2 

 70.1 

 69.7 

 64.4 



75.2 



From this table and the preceding it is noted : 

 (i) That the average yield ranges from 82 bushels for the 

 Early Pearl to 64.4 bushels for the Senator. This is a range 

 of over 17 bushels or very nearly twice as much as for the 12 

 pure lines. 



(2) The average yield is 75.2 bushels against 80.8 for the 

 pure lines. 



(3) The highest yield of the varieties is 82 bushels while 

 three of the pure lines exceed this figure. The highest yield in 

 the pure lines is 86.6 bushels. 



(4) Only four of the 11 commercial varieties give a better 

 yield than the poorest of the pure lines. 



(5) The seven Banner pure lines average to yield 81 bushels 

 per acre while the parent variety in the same years gave 79.7 

 bushels. This is an average increase of a little less than a 

 bushel and a half per acre. Of course some individual lines 

 far exceeded this. 



(6) The four Irish Victor pure lines averaged to yield 81.1 

 bushels while the parent variety gave only 75.2 bushels an 

 increase in the pure lines of nearly 6 bushels per acre. 



While these differences may appear insignificant to some 

 readers, such is not the case. These varieties and pure lines 

 have been tested under conditions which are as nearly uniform 

 for all plots as it is possible to make them. Corrections nave been 

 applied which take account of differences in the fertility of the 

 soil of different plots. Checks upon the accuracy of the work 

 have been applied wherever possible. Further the uniformity 



