CORN GROWERS ASSOCIATION. 



05 



For low protein and low oil we multiply the percentages together 

 and use the lowest product as the selection coefficient. 



For high protein and low oil in the same corn, we divide the per- 

 centage of protein by the percentage of oil and use the highest quotients 

 as our selection coefficients. 



TABLE 3-SELEOTION OF SEED CORN FOR HIGH PROTEIN AND HIGH OIL. 



For low protein and high oil we divide in the same manner, but use 

 the lowest quotients for selecting the best ears. 



Table 3 illustrates the value of this method as applied to the selec- 

 tion of the best seed ears for both high protein and high oil. 



It will be observed that some ears which are high in only one 

 desirable constituent (see No. 2 and No. 10) must be discarded because 

 the selection coefficients which they give are even below the average; 

 while other ears which may be quite low in one constituent (see No. i 

 and No. 3) still furnish acceptable selection coeft"icients. 



THE BREEDING PLOT. 



The 40 selected seed ears are planted in 40 separate parallel rows, 

 one ear to a row, consequently the breeding plot should be at least 40 

 corn rows wide and long enough to require about three-fourths of an 

 ear to plant a row. It is well to shell the remainder of the corn from 

 all of the 40 ears, mix it together, and use it to plant a border several 

 rows wide entirely around the breeding plot, to protect it, especially 

 from foreign pollen- 

 In my judgment one of the most practical and satisfactory locations 

 for the breeding plot is in a larger field of corn planted with seed which 

 is as nearly as possible of the same breeding as that planted in the breed- 

 ing plot itself. The stock seed for this field should always be selected 

 from the previous year's breeding plot and it may well include as many 

 of the 160 rejected ears as are known to be above the average of the 200. 



