LANCASTER Soil, climate,
Utural practices and hybrid
determine how thick com should
be planted, but the arithmetic for
top com yields is simple, says
Wayne Fowler, director of
agronomic education, DeKalb
Agßesearch, Inc., DeKalb, HI.
It takes 21,000 half-pound ears to
produce 150 bushel per acre com;
it takes 28,000 to produce 200 bushel
per acre com,
“You’ve got to have the plants to
get yield,” Fowler says.
Yield potential is limited by the
interaction of moisture
availability, soil fertility and
length of season, so realistic yield
goals represent downward ad
justments from maximum yield
potential based on experience with
insects, weeds, disease and other
yield-limiting factors.
“Several years of studies at
DeKalb’s experiment farm,
Dayton, lowa, show the company’s
.hybrids consistently produce
jfe\gher yields under high plant
populations,” Fowler explains.
This has proven to be true
regardless of fertilization rate.
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Planting rates affect com yields
“Although excessive populations
put undue stress on plants,
evidence indicates that more yield
goals are missed by planting too
little rather than too much seed. ’ ’
Narrow rows and high
population rates, 'when used in
combination with adequate fer
tility levels, earlier planting, and
weed and insect control, are
responsible for part of the upward
com yield spiral of recent years.
Improved hybrids have con
tributed significantly.
There appears to be no good
reason for a corn-soybean grower
to plant any of his crop in rows
wider than 30 inches, according to
DeKalb’s seed experts.
Narrow rows provide a full
canopy earlier in the season and
reduce evaporation and air
movement which saves water. The
canopy also shades weeds sooner
which improves weed control.
In one three-year test conducted
by DeKalb researchers, a harvest
stand of 28,000 plants per acre in
either 20 or 30-inch rows gave
optimum yields with seven of the
company’s most popular hybrids.
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The hybrids were tested at
harvest populations of 21,000,
28,000 and 35,000 plants per acre in
20; 30 and 40-mch row spacmgs. In
all cases, the lowest yields were
made in 40-inch rows at the 21,000
population. Highest yields came
from the 20 and 30-inch rows, with
little difference between them.
Fowler points out that these tests
were conducted on excellent soil
and in an excellent corn-growing
area fertilized to produce 150
bushel per acre com.
HARRISBURG - March 1981
egg production in Pennsylvania
totaled 377 million, according to
the Pennsylvania Crop Reporting
Service;
The March production was two
percent above the 369 million eggs
produced in March 1980.
The March average of 16.8
million layers was two percent
above a year ago. Egg production
per 100 layers was 2246 compared
with 2240 in March 1980.
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At the 28,000 population, the
average yield of the seven hybrids
tested was 149 bushels per acre in
20-mch rows; 148 in 30’s. At these
same populations, the 40-inch rows
yielded 10 bushels less com per
acre.
Fowler suggests these tips to
help you get the desired stand:
• Be sure to drop enough seed.
Not every seed will emerge, so set
your planter to drop 10 to 15% more
seed than the desired stand.
• When planting early, drop
Pa. egg production up 2 percent
The nation’s laying flocks
produced 5.98 billion eggs during
March, 1981, less than one percent
below the 6 billion produced a year
ago. The number of layers for
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approximately 2,000 more kernels
per acre than you would normally.
Reason: Earlier planting results in
smaller plants with less total leaf
area per acre. So, for optimum
yields, you can put down more seed
per acre.
• Finally, calibrate your
planter for each seed lot and for
seedbed conditions. Then use the
correct seed plate or planter
setting and proper speed to get the
seed drop you want.
March averaged 287 million,
slightly above the 286 million last
year. Egg production per 100
layers during the month was 2081
compared with 2079 a year ago.
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