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Hybrid Corn has now proved its worth and is definitely here to stay. The benefits of planting Hybrid Corn over 
open pollinated corn are much larger yields, both in grain and for ensilage purposes, strong roots, and evenness of 
ears on the stalk. Stalks stand up much better. 
This year we will again feature Colorado grown State Registered and sealed Hybrid Corn. This means that the corn 
is grown under rigid rules and supervision. Stock seed must be of known and proven parentage. Fields have to 
be isolated from all other corn and carefully detasseled at the proper time. 
Germination must be high to rate Blue Tag. 
Colorado Grown Corn is adapted to this region. 
COLORADO EXPERIMENT STATION TESTS 
Our state extension service has tested Hybrid Corn over a four-year period. The open pollinated corn used as a 
check was Minnesota 13 corn. 




AVERAGE YIELDS AT FORT COLLINS, 1937 TO 1940 

Yields Shelled Corn 
No. in Bu. Per Acre 
Relative wHiey 

Days of Silk Pet. Suckers Per Cent 
Maturity Test Hybrid Check Hybrid Check Hybrid Check of Check 
IOWA oor oun hae Late 4 87.8 82.0 ive 132.4 109.2 212 
WaASCOnSiMe O96;.e vies alors Late 3 87.3 82.7 9.0 2. 7 134.7 111.6 120.7 
WiaAiScCOnSin= G2s.0 ohare sere Slightly Late 2 87.0 83.0 8.6 3.7 127.6 109.8 116.2 
Wasconsing: 50s cae. rer Sameas Check 3 83.2 82.7 as. 2.0 126.0 111.6 112.9 
WISCONSIN: 455. cere Early 3 81.2 82.7 6.4 2.7 119.8 T1126 107.3 
AT ROCKY FORD—REID YELLOW DENT USED AS CHECK 
TOW 98 Oe wate ees bck Early 4 76.2 83.8 sae Am 101.6 78.7 129.1 
WISCONSIN 69.6: ce eres: Early 2 (3x73 83.7 8.3 40.2 97.4 82.8 117.6 


During these years, it must be remembered that the first frosts were later than the average date. 
The average from 1889 to 1937 has been September 18th. 
The first frost in 1937 was October 5th; in 1988, October 18th; in 1939, September 30th; 
Therefore, for grain raising purposes, the later maturing corns might not always mature. 
and 1940, October Ist. 
In the Fort Collins area, Wisconsin 570, Wisconsin 625 and Iowa 939 and Wisconsin 696 should do well for ensilage. 
At slightly lower altitudes (below 4,500 feet) and on warmer soils, Iowa 939 and Wisconsin 696 appear to be adapted 
for grain raising. 
In a Western Slope test, conducted on the Montrose-Delta county line, Iowa 939, Wisconsin 570 and Wisconsin 455 
outyielded open pollinated Crawford Yellow Dent and Colorado 13 by a good margin. Wisconsin 455 matured earlier 
than the field varieties, Wisconsin 570 at about the same time and Iowa 939 slightly later. 



WISCONSIN 455 (COLORARO 125) 
One of the best to use for higher altitudes. 
A Yellow Corn that is regarded as maturing in 100 days. 
It will usually mature grain in northern: Colorado when 
planted as late as June ist. It is about ten days earlier 
than Minnesota 13 or Colorado 13. 
IOWA 939 
A Yellow Corn. Regarded as a 120-day corn. Usually ma- 
WISCONSIN 625 (COLORADO 175) 
Yellow Grain. Regarded as a 115-day corn. 
tures grain in northern Colorado. 
excellent for ensilage. 
WISCONSIN 696 (COLORADO 220) 
Yellow Grain. Regarded as a 120-day corn. A fine ensi- 
lage corn for northern Colorado. Usually matures grain 
in the southern part of Weld County and in the Fort 
Usually ma- 
A good yielder and 
tures grain in Fort Morgan and Greeley area on warm 
soils. Suitable for Arkansas Valley and the lower alti- 
tudes on the Western Slope. A heavy yielder. A good 
ensilage corn. 
WISCONSIN 570 (COLORADO 151) 
A Yellow Corn. Regarded as a 110-day corn. Usually 
matures grain in northern Colorado. Yields well. Excep- 
tionally well for grain, it has outyielded Colorado 13 under 
actual farm conditions as much as 40%. 
Page Thirty-six 
Morgan area. Suitable for the Arkansas Valley and lower 
altitudes on the Western Slope. 
Our grower advises not to plant Hybrid too early. In the 
northern part of the state, May 5th to 15th, is the best 
time to plant. 
All corn should be treated before planting. Barteldes 
Corn Treatment discourages pheasants, crows and cut- 
worms. 
Semesan, Jr.—Reduces seed rotting, improves stands and 
increases yields. 

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