174 MAINE AGRICULTURAL EXPERIMENT STATION. I914. 



concluded that the Imported Scotch variety is much less affected 

 by varying external conditions than are the other varieties. 



5. The variety showing the next smallest variability is the 

 Lincoln. The Abundance, Irish Victor, Kherson, Clydesdale, 

 Silver Mine and Minnesota No. 26 all show comparatively 

 small coefficients of variation. Under the conditions in 1913 the 

 four plots of each of these varieties yielded at relatively uniform 

 rates. 



6. The varieties Banner, White Plume, Garton No. 5 and 

 Gold Rain showed a large amount of variation. The Rebred 

 60-Day, Daubeney and the Senator showed an extremely large 

 variability. These figures indicate that the yield of these varie- 

 ties are very greatly affected by the difference in soil or other 

 conditions which may be present in any field. 



It must be pointed out again that the above conclusions are 

 only tentative. Only four plots of each variety were used. It is 

 always possible when such a small number is used that all four 

 plots of one variety fell under much more similar conditions 

 than the plots of another variety. In the course of time we hope 

 to have this information for these varieties over a series of 

 years. The present data would seem to indicate that the Im- 

 ported Scotch is less affected by environmental changes than the 

 other varieties, while the Senator is very greatly influenced by 

 such differences. 



The Average Yield of Grain. 



In the following paragraphs the average yearly yield of grain 

 together with the variation in yield from year to year for each 

 variety will be discussed. 



Of the 41 varieties or strains listed in Table i only 11 have 

 been tested for all four years. Of the remaining varieties a few 

 have been tested three years and a number for two years. Those 

 varieties which have been tested for only one year will be 

 omitted from this discussion. For purposes of comparison the 

 varieties which have been tested for four years will be tabled 

 separately from the others. 



A. VARIETIES TESTED FOR FOUR YEARS. 



Table 8 gives the yield of grain for the eleven varieties tested 

 all four years. The varieties are arranged in the order of their 



