90 



FIELD CROP PRODUCTION 



test is made in duplicate, the second series of rows being 

 some distance from the first. At harvest time each row 

 is husked separately, and the yield is determined in the 

 same way as in the variety test. Seed corn is not selected 

 from the rows giving the highest yield, because cross- 

 pollination has taken place, and probably the low as well 



FIG. 27. A corn-breeding plot. Rows 1, 3, and 4 have been detasseled. 



as the high yielding ears are represented in the ears of 

 each row. The ear-to-row test is only a method of picking 

 out the highest yielding ears, and not for the production 

 of seed corn. When the rows are planted, only a portion 

 of the ear is used, the remainder being preserved for 

 crossing the next year. 



69. The breeding plot. The remnants of the four 

 or five highest yielding ears are planted the next season 

 in the breeding plot. This plot should be some distance 



