Pioneer Hybrid Maturity 
• Pioneer hybrids recommended for each of Regions 
A, B, C, and D in Minnesota and South Dakota are 
classified under three groups: (1) early maturing, 
(2) medium maturing, and (3) late maturing. These 
groupings are made to meet: first, climatic condi¬ 
tions; second, various soil types and conditions pe¬ 
culiar to Minnesota and South Dakota; third, date of 
planting; and, fourth, personal demands of the 
farmers. 
REGION A . . . 
Pioneer 355 can be grown with safety in Region A when planted 
on Tery rich soils not later than the middle of May. This hybrid 
should not be planted on slow or poor soils in this region. 
REGION B . . . 
In Region B, early maturing Pioneer Hybrids 355 and 357 should 
be used for late plantings; for slow soils if planted around May 
15th-25th; and for locations where the first freeze occurs unusually 
early in the fall. Under these conditions, with normal weather, 
the early hybrids will ripen and produce good, sound com. 
Under average climate and average soil fertility in Region B, 
medium maturing Pioneer Hybrid 352 will ripen ahead of the 
averoge first freeze if planted by May 10th. It should not be 
planted late on slow or poor soils. 
The late maturing group. Pioneer Hybrids 322, 324, 335, and 349, 
is recommended only for very rich or fast soils; for quite early 
planting on soils of average to high fertility; and for silage or 
fodder com. None of these hybrids should be planted late, nor 
should they be planted on slow or poor soils. 
REGION C . . . 
In Region C, the early maturing Pioneer Hybrid 352 should be 
used for late plantings; for slow soils if planted around May 
15th-25th; and for locations where the first freeze occurs un¬ 
usually early in the fall. Under these conditions, with normal 
weather. Pioneer 352 ripens and produces good, sound com. 
Under normal climate and average soil fertility, the medium ma¬ 
turing group. Pioneer Hybrids 322, 324, 335, and 349, will ripen 
ahead of the average first freeze if planted by the middle of May. 
The hybrids in this group should not be planted too late on slow 
or poor soils. 
The late maturing Pioneer Hybrids 330 and 314 are recommended 
for rich or fast soils; for early planting on soils of average to high 
fertility; and for silage or fodder com. Neither of these hybrids 
should be planted late on slow or poor soils. 
REGION D . . . 
In Region D, along the Missouri River, Pioneer Hybrids 330 and 
314 are recommended for normal planting. 
PIONEER 
