THE BREEDING OF CORN 199 



mature the detasseled rows should be harvested separately 

 and the corn from each row weighed. From the ten or 

 twelve highest yielding rows, 100 of the best ears should 

 be selected for planting the breeding plot next year. The 

 remainder of the seed from the best yielding rows should 

 be used for planting an increase plot or for planting the 

 general crop. 



244. Third year. The breeding plot should be 

 planted as before with the best selected 100 ears; the 



FIG. 38. Showing effect of five generations of breeding for high ears 

 and low ears. The white tape marks the position of the ears on the 

 _*it_ 



stalks. 



alternate rows should be detasseled and seed saved again 

 from the best detasseled rows. The remainder of the 

 selected seed should be used for planting an increase 

 plot provided it is not sufficient for planting the gen- 

 eral crop. The corn produced on the increase plot 

 should be used for planting the general crop the fourth 

 year. 



One should continue this system of breeding, maintain- 

 ing each year the breeding plot, the increase plot, and the 

 general crop which is always planted from the improved 

 seed grown on the increase plot. With this treatment the 



