OF PIONEER HYBRIDS 
EXPERIMENTAL TESTING HYBRID CROSSES—Second Step 
Pioneer Breeders make about 375,000 hand- 
pollinations every year. 
Out of the hundreds of ‘'single-crosses” pro- 
duced every year, only a portion are good 
enough for experimental work in final “four- 
way crosses” 
Of the hundreds of final crosses made year 
after year by Pioneer, only a small number 
prove superior to those already produced. 
These few outstanding combinations are then 
grown and tested for a number of years in the 
localities where they may be sold if they con- 
tinue to be superior. 


POLLEN BAGS ON TASSELS 


LOCATIONS showing large 
yield test plots where Pioneer 
SMALL INBREDS CROSSED PRODUCE hybrid crosses are tested TESTING THE YIELD 
HYBRID 


FINAL “FOUR WAY” HYBRID CROSS—Third Step 
Pioneer hybrid seed corn is produced in large crossing fields near 
modern drying and grading plants. ve 
Detasseling the fields from twelve to fifteen times each season requires 
hundreds of capable men and women. 
Pioneer hybrid seed corn is picked only from the detasseled rows. The 
corn on the male rows is self-pollinated and is not used as hybrid seed. 

HUNDREDS DETASSEL PIONEER PULLING A TASSEL 
DETASSELED FIELD OF PIONEER 
