PIONEER HI-BREDS FOR NORTHERN IOWA AND SOUTHERN 
MINNESOTA 
!.♦ PIONEER HI-BRED 355. This hybrid, through a number of 
years, has demonstrated itself a faithful standby in South¬ 
ern Minnesota and Northern Iowa where early maturity is 
of prime importance. Its period of maturity is the same as 
open-pollinated varieties grown in this region. But, of course, 
in yield and all around quality, the hybrid surpasses by far 
the open-pollinated corn. 
The ears on this Pioneer Hi-Bred are longer than those of 
open-pollinated strains, and strong shanks keep the ears from 
dropping off the stalks. 
Because of strong roots and stiff stalks. Pioneer 355 excells 
in lodging performance, standing up extremely well under 
bad weather conditions. This ability to stand up makes it 
easier to husk. 
2. PIONEER HI-BRED 357. The consistently high yield, extra 
early maturity, strong roots, sturdy stalks, and leafy appear¬ 
ance are the outstanding characteristics of this cross. Its 
heavy foliage stamps it as a superior stock in Northern Iowa 
where corn leafage is usually scanty. 
The early maturity and yielding ability of Pioneer 357 re¬ 
ceived special mention in the 1936 “Iowa Corn Yield Test” 
i-eport which stated, “One of the difficulties in obtaining a 
satisfactory hybrid for northern Iowa is to find one sufficiently 
early to escape damage in a short growing season and yet 
able to make a satisfactory yield as compared with later 
hybrids in longer growing seasons. Pioneer Hi-Bred 357, on 
the basis of 2 years, had a relative moisture percentage of 
89.0 and yielded 12.1 per cent more than the open-pollinated 
corn”. This cross is not more than three days later in matur¬ 
ity than Pioneer 355. 
Pioneer 357 is the outstanding pi'actical hybrid for extreme 
Northern Iowa and Southern Minnesota where early maturity, 
sound yield, and strong shanks are important. 
3. PIONEER HI-BRED 335. In a normal year, Pioneer Hi-Bred 
335 matures a little late in the extreme northern tier of Iowa 
counties. Its best region is along the second row of counties 
down from the Minnesota border. 
In appearance this cross is a bi’oad leafed looking strain, 
having heavy, stiff stalks, low ears, high yield, low moisture 
content at harvest time, and strong shanks. 
NEW PIONEER HI-BRED CROSSES COMPARED WITH OLDER PIONEER HI-BRED CROSSES 
AND OPEN POLLINATED CORN IN OUR OWN EXTENSIVE YIELD TESTS 
Average Results for 1934-1936-1936 
FOR NORTHERN IOWA AND SOUTHERN MINNESOTA 
Pioneer 
Hi-Bred Averagre Bu. 
No. 
Per Acre 
335 . 
. 56.6 
357 . 
. 52.1 
*355 .. 
. 48.4 
Open Pollinated 
40.7 
Increased Yield 
Per Acre 
Over 0. P. 
Percentage 
Yield 
% of 0. P. 
Improvement of New Hybrids Compared 
Pollinated (O. P.) Corn 
Stand Moisture Ear Height 
% of Ave. % of 0. P. % of O. P. 
to Open 
*Lodging 
% of 0. P. 
Approximate 
Maturity 
No. of Days 
Outstanding 
for Cold 
Resistance 
15.9 Bu. 
140 
109 
114 
108 
49 
103 
—V 
11.4 “ 
128 
107 
99 
71 
65 
93 
7.7 “ 
119 
101 
97 
98 
65 
90 
—V 
100 
88 
100 
100 
100 
Pioneer 
Hi-Bred 
No. 
315 . 62.2 20.1 
322 . 60.9 18.8 
*323 . 56.6 14.5 
Open Pollinated 42.1 
FOR NORTH 
CENTRAL 
IOWA 
Bu. 
148 
109 
102 
148 
103 
104 
<6 
131 
107 
101 
100 
91 
100 
97 
77 
107 
—V 
94 
59 
105 
98 
81 
105 
—V 
100 
100 
Pioneer 
Hi-Bred 
No. 
308 . 
FOR SOUTH 
CENTRAL 
IOWA 
62.5 
18.1 
Bu. 
142 
102 
100 
100 
91 
120 
314 . 
61.1 
16.7 
if 
138 
107 
96 
97 
68 
118 
307 . 
60:8 
16.4 
ii 
137 
107 
98 
97 
58 
120 
315. 
59.2 
14.8 
ii 
133 
108 
91 
99 
69 
107 
308-D . 
56j6 
12.2 
ii 
125 
102 
99 
101 
60 
120 
313-A .. 
53.7 
9.3 
ii 
121 
103 
91 
93 
80 
110 
311 . 
53.2 
8.8 
ii 
119 
98 
94 
98 
65 
110 
Open Pollinated 
44.4 
100 
95 
100 
100 
100 
Pioneer 
Hi-Bred 
FOR SOUTHERN IOWA 
AND NORTHERN 
MISSOURI 
No. 
305-A . 
53.9 
19.0 Bu. 
167 
109 
124 
97 
75 
125 
314. 
52.8 
17.9 “ 
152 
102 
98 
92 
64 
118 
307 . 
51.9 
17.0 “ 
150 
102 
99 
95 
63 
120 
308 . 
50.6 
15.7 “ 
150 
102 
104 
100 
75 
120 
308-D . 
49.8 
14.9 “ 
144 
103 
98 
97 
60 
120 
* 306 . 
43.7 
8.8 “ 
125 
101 
101 
100 
83 
*311 . 
42.5 
7.6 “ 
120 
102 
94 
96 
64 
110 
*311-A . 
Open Pollinated 
41.8 
34.9 
6.9 “ 
120 
100 
104 
92 
96 
100 
92 
100 
71 
100 
110 
—V 
—V 
—V 
—V 
—V 
A quantity of each of above crosses except No. 306 are in production for 1938 planting. 
♦Figures in lodging column indicate the relative strength of stalks 
and heaviness of root systems. The lower the figure the better it is. 
* Older line of Pioneer Hybrids. 
