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ALL PIONEER HI-BREDS 
CAREFULLY TESTED 
The Pioneer Hi-Bred Corn Company carries on complete, 
scientific yield test projects for testing the yield, lodging, and 
maturity of Pioneer crosses before they are placed on the 
market. Fifty-five Pioneer test plots are scattered throughout 
Iowa, with additional test fields in Minnesota, Illinois, Indiana, 
and Ohio. 
Pioneer Hi-Breds tested for yield, lodging and maturity are 
planted, harvested, and computed with the same accurate 
methods as are used in the “Iowa Corn Yield Test.” In spite 
of the superiority of Pioneer Hi-Bred Seed Corn, our breeders 
persistently carry on endless research for still better seed. 
Unless our hybrids make, in several years of testing, a high 
average record in many different locations, they never reach 
our customers. All Pioneer Hi-Bred crosses undergo a series 
of rigorous tests for a period of three and four years to deter¬ 
mine their superiority over present commercial hybrids. 
After an experimental cross has proved itself consistently 
superior over our present commercial hybrids, it is then pro¬ 
duced on a large scale and offered for sale. 
PIONEER HI-BREDS FOR 1938 
We are pleased to announce the development of several new 
and improved Pioneer Hi-Breds which, in years of testing, 
have demonstrated their superior quality and performance. 
To acquaint you with these crosses, a brief outline of each 
new Pioneer Hi-Bred is listed, together with our older lines, 
under the territory for which it is best adapted. 
The maps on page thi’ee will aid you in determining which 
crosses are adapted to your community. It is true that un¬ 
usual seasons sometime cause our hybrids to do well in terri¬ 
tories where they are not recommended. Nevertheless, it is 
wise to assume normal weather, and order corn for your local¬ 
ity as indicated on the maps. 
Farmers making late plantings, or planting on wet, cold 
soil, should use a hybrid of earlier maturity than the one rec¬ 
ommended for their territory. On the other hand, farmers 
planting early on rich soil can often get good results by using 
later maturing hybrids farther north than is recommended. 
