STUDIES ON OAT BREEDING. 



175 



average yield for the four years. The yield of each variety 

 for each year is given together with the four year means and 

 their probable errors. Finally the standard deviations and 

 coefficients of variation for each variety are given. 



Table 8. 

 Yield of Grain, Varieties Tested Four Years. 



Variety. 



Irish Victor 



Imported Scotch 



Lincoln 



Prosperity 



President 



Banner 



Silver Mine 



Kherson 



Victor 



Regenerated Swed. Select 

 Senator 



Average 



Bushels pee Ache. 



1910 



1911 



66.4 49.9 



1912 



59.6 



1913 



Mean. 



Standard 

 Deviation. 



Coefficient 



of 

 Variation. 



61.8 



63.68: 

 63.08: 

 62.98: 

 62.18: 



60 . 00 : 



60.48: 

 58.93: 

 57 . 68 : 

 57.60: 

 57.60: 

 49.25: 



= 1.90 

 =0.96 

 = 3.01 

 = 1.89 

 =2.31 

 = 3.07 

 =2.43 

 = 2.82 

 =0.70 

 = 3.78 

 =2.15 



59.46 



5.64: 

 2.83: 

 8.94: 

 5.61 : 

 6.85: 



9.10: 

 7.20: 

 8.37: 

 2.08: 

 11.19: 

 6.36: 



= 1.34 

 =0.67 

 =2.13 



=0.50 

 =2.67 

 = 1.52 



6.74 



8.85: 



4.49: 



14.19: 

 9.02: 

 11.30: 

 15.05: 

 12.23: 

 14.51 : 

 3.61 : 

 19.43: 

 12.94: 



=2.13 

 = 1.07 

 = 3.45 

 =2.17 

 =2.73 

 = 3.67 

 = 2.96 

 = 3.53 

 = 0.86 

 =4.81 

 = 3.14 



11.42 



The yearly yields for these eleven varieties are displayed 

 graphically in Figure 59. 



From Table 8 and Figure 59 the following points may be 

 noted. 



1. The highest average yield of any variety for the four 

 years was 63.68 bushels for the Irish Victor. The imported^ 

 Scotch ranked next with 63.08 bushels. The Lincoln and Pros- 

 perity yielded at nearly the same rates. The President and 

 Banner gave 60.5 bushels. The Silver Mine, Kherson, Victor 

 and Regenerated Swedish Select averaged to yield at a slightly 

 lower rate. The Senator shows the lowest yield, 49.25 bushels. 



2. The average yield of these eleven varieties for the four 

 years was 59.5 bushels. In 1910 these same varieties averaged 

 66.4 bushels per acre; in 191 1 they averaged 49.9; in 1912, 59.6 

 and in 1913, 61.8 bushels. Thus the best yield was obtained in 

 the first year. Further an inspection of Fig. 59 shows that with 

 one exception (Imported Scotch) each of these varieties yielded 

 as well or better in 1910 than in any other year. There are 

 several possible reasons for this. In the first place the 1910 

 plots were seeded with two bushels per acre by measure, while 



