Nov. 1, 1919 



Yellow-Berry in Hard Winter Wheat 



161 



Table II. — Sutmnary of yellow-berry in hard winter wheat, igo8 



Date of harvesting, 1908. 



Total 

 number 

 of cases. 



Number 

 of pure 

 strains. 



Percent- 

 age of 



yellow- 

 berry. 



Number 



of 

 controls. 



Percent- 

 age of 

 yellow- 

 berry. 



Average 

 percent- 

 age of 

 yellow- 

 berry. 



June 25.. 

 26.. 



30-- 

 July I.... 

 3.... 

 6.... 

 10 



16 



17 



4 



82 



IS 



5 



10 



20 

 21 



o 



7 



5 

 4 



45 

 65 

 33 

 71 



9 

 7 

 4 

 49 

 8 



28 



25 

 20 

 26 

 45 



45 



24 

 23 

 20 



34 

 54 

 33 

 55 



Tables I and II give the results for 73 pure strains and 83 controls 

 out of the total number of 'jj and 87, respectively, that were originally 

 planted. The average percentage of yellow-berry in the control plots 

 is given in Table III. 



Table III. — Average percentage of yellow-berry in control plots, IQ08 



From this table it appears that the control rows were quite constant 

 in their tendency to produce yellow-berry. However, as shown in 

 figure I, there is considerable variation in the amount of yellow-berry 

 in individual rows. The general trend of the percentage of yellow- 

 berry in the pure strains follows that of the controls. This indicates 

 that the dififerences depend upon the same causes in the pure strains 

 as in the controls, and that the changing conditions in different parts of 

 the plot had more influence in causing an increase or a decrease in 

 yellow-berry than did any hereditary factors. 



The yield per row presents a similar phenomenon. There is a greater 

 variability in the yield of the individual rows in the pure strains than in 

 the control rows, but the general upward and downward trend of the 

 two curves coincides very closely. This would indicate that external 

 conditions in the plots were more important than varietal characteristics 

 in determining both the yield and the percentage of yellow-berry. 



