90 



CORN CROPS 



65. Mass Selection. — The result of mass selection in 

 corn is ^vell illustrated bj^ the history of any of the older 

 varieties, as Learning, Reid, or Boone County White. 

 After many years' selection, the breeder succeeded in 

 producing a more or less uniform type. 



For example, the Leaming varietj^ was originated by 

 Mr. J. S. Leaming, of Hamilton, Ohio : ^ " After fiftj'-six 

 years' selection, Mr. Leaming produced a corn having as 

 variety characteristics a distinctly tapering ear, fairly 

 large butts, rather pointed but well-covered tips, with 

 kernels of a deep yellow color, with very irregular rows." 



Hartley produced a corn with twisted rows by select- 

 ing such ears from the field. At the Nebraska Agricultural 

 Experiment Station, a shallow-kerneled type of corn was 

 fixed by continuous selection after five years. - 



66. Pedigree selection. — A striking example has been 

 reported from the Illinois station.'^ Two sets of Leaming 



TABLE XIII 



General Averages of Crops produced in Corn Breed- 

 ing, FOR High Ears and for Low Ears 



Height of E.vr 



Height of Plant 



' Mo. Agr. Exp. Sta., Bui. S7 : 113. 

 2 Nobr. Agr. Exp. Sta., Bui. 113 : 20. 

 ' 111. Agr. Exp. Sta., Bui. 132. 1909. 



