CHOOSE THE CHARACTE 
PIONEER HYBRID MATURITY 
Pioneer hybrids recommended for the North Central 
section and the Southern half of Iowa are classified 
under three groups: (1) early maturing, (2) medium 
maturing, and (3) late maturing. These groupings are made 
to meet: first, climatic conditions; second, various soil types 
and conditions peculiar to the North Central section and the 
Southern half of Iowa; third, date of planting; and, fourth, 
personal demands of the farmers. 
The recommendations are based on average temperature 
and rainfall for the North Central section and the Southern 
half of Iowa. These two factors, in abnormal seasons, vary 
the maturity of corn considerably. 
STRENGTH OF ROOTS: 
STIFFNESS OF STALKS: 
SMUT RESISTANCE: 
DROUGHT RESISTANCE: 
EAR DROPPING RESISTANCE: 
SIZE OF EAR: 
DEGREE OF KERNEL DENT: 
EAR HEIGHT: 
LENGTH OF HUSK: 
Very strong.307, 317, 322, 324 
330, 331, 335 
Very stiff.307, 317, 322, 324 
330, 331,332, 335 
Excellent.313, 317, 322, 330 
331,352, 357 
Excellent.307, 313, 317, 322, 352 
Excellent.307, 313, 314, 315, 318A 
322, 331, 332, 349, 357 
Large .313,314,317 
318A, 331,332 
Rough (moderately) .322, 324, 330 
331,349, 357 
Low .318A,322,324,330 
331,335, 352 
Long .313, 317, 318A, 322, 324 
330, 331,332, 352, 357 
P I O Nl E E R 
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