114 



CORN CROPS 



those strains that give maximum results. This would 

 necessitate maintaining the pure strains each in a separate 

 field from year to year, and having another seed field where 



Fig. 35. — Pure types as developed by inbreeding. No. 11 produces 

 many tillers, and was reddish in color. No. 12 was free from tillers. 



they would be planted in alternate rows. One strain 

 would be detasseled in this seed patch, thus giving each 

 year a stock of hybrid seed. 



