Plant Hybrid Corn This Year 
What is Hybrid Corn? 
The first step is to inbreed ordinary corn. 
This is done by protecting the ears with 
paper sacks and then see that each ear is 
fertilized only by its own pollen. This is 
kept up for about 7 years. Each year the 
poor ones are discarded. In that way pure 
line is established, with all undesirable fea¬ 
tures eliminated through the inbreeding 
process. At the end of the 7 years these in¬ 
breds have become very small but by crossing 
them with other inbreds you restore the vigor 
and vitality. Then you have Hybrid Corn. 
tests. At least that is the way they do it in 
Iowa, Illinois and Wisconsin and I get most 
of my seed from there. 
I am not saying that only state certified 
Hybrids are good. There are fine Hybrids 
that are not state certified. When you buy 
those you rely on the grower or dealer en¬ 
tirely to get the kind of com you expect to 
receive. State Certified Hybrid has a state 
tag showing that the variety in the bag has 
all the necessary qualifications of superior 
quality. 
The Kind of Hybrid I Sell 
How do Hybrids Excel? 
Good Hybrids or crosses will yield from 
10% to 20% more corn per acre than ordi¬ 
nary open field corn. There will be prac¬ 
tically no barren stalks in the field. Many 
stalks bear two ears. The stalk and root 
systems are much stronger. You seldom see 
a broken stalk in a field of good Hybrid Corn. 
Hybrid Corn seems to withstand unfavorable 
conditions better because it has more vigor 
and vitality. It is the most profitable corn 
to grow. 
Are All Hybrids Better? 
No, all Hybrids are not better. Some Hy¬ 
brids are not nearly as good as common com. 
It all depends on the kinds of inbreds that 
are crossed. Some crosses are far superior 
and some are greatly inferior. 
How Can I Know 
When a Hybrid is Superior? 
The safest way is buy state certified Hy¬ 
brid seed corn. In order to be state certified 
it must have a combined superiority in yield 
and strength of stalk of 25% over average 
corn. This is determined in state yield con- 
In our special circular you will find a list 
of some varieties I can supply now in State 
Certified only. Others in both certified and 
non-certified. My non-certified stock may be 
developed from F-2 seed stock. They are true 
Hybrids of leading varieties and ones that I 
feel I can recommend to my customers. 
Ask for Circular on Hybrid Corn 
I have a circular that gives quite a clear 
picture of what Hybrid Corn really is. It 
explains how it is developed and why it is 
expensive to produce. You will find that 
interesting and instructive. Ask my sales¬ 
man for a free copy. 
This circular also describes the different 
kinds of Hybrids I have for you. There are 
many of them. Some are extra good and 
some are decidedly inferior. I handle those 
having a definite record of superiority in 
yield and strength of stalk. It will pay you 
to plant only proven Hybrids and you can 
by properly studying this circular. It’s free 
for the asking. 
SEED CORN GUARANTEE 
We take great care in the Selection and Prepara¬ 
tion of our SEED CORN. As we take great Pride 
in the quality we distribute, 
WE GUARANTEE our Seed 
Corn to be carefully graded 
and of Good Germination. It 
has been tested, but you may 
test it yourself or send sam¬ 
ple of it to be tested for 
Germination. If the other 
tests do not agree closely 
with ours, or if you are not 
fully satisfied, the Corn may 
be returned at our expense at 
any time within Thirty Days 
of shipment for full refund of 
purchase price. 
SUN-FIELD SEED SERVICE 
CHICAGO, ILLINOIS 
