—Lancaster Farming, Saturday, October 15,1977
18
Critical corn growth stages found
By DIETER KRIEG
LITITZ - According to
latest research conducted by
crops specialists, many
fanners are mistaken in
their belief that corn is on its
way towards good yields
once it stands knee-high.
The reason for this
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common thought is that the
young plants can shade the
soil to some degree at that
point, thereby helping to
retain soil mositre and
retard weed growth, the
young plants are through the
“baby stage” of growth. But
all that doesn’t assure a good
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crop by any means,
farmers well know.
What many farmers and
researchers have not known
until recently, however, is
that the size of the ear the
mature plant will bear is
determined at the knee-high
stage. Therefore, corn
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(g) MOTOROLA
specialists at the Pioneer
Seed Com Company em
phasize that this stage of
growth is very critical if
maximum yields are to be
realized.
The revelation has been
made during recent field
days sponsored by the seed
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corn firm. The last in a
senes of these meetings was
held near here this week on
the Levi Rohrer farm. Ap
proximately 150 fanners
were m attendance for the
mid-morning program,
which included presen
tations on insect and weed
control, yield comparisons,
and com growing tips.
John Weideman, Pioneer
representative, noted that
the first stress period for
com after emergence is the
knee-high stage. It is one of
four major stress periods,
his company has found. The
A sizable group of
Lancaster County corn
growers expressed in
terest in latest
technology at a recent
field meeting near Lititz.
Speaking to the
gathering is John
Weideman. He notes that
the length of the ear of
corn is determined by the
plant when it is knee
high.
others are: emergence,
pollination, and good
weather at harvest time so
the ears may dry.
The Pioneer people
illustrated their point by
comparing ears of corn
which were only partially
filled out with those that
were. The explanation for
the difference is that ear size
is determined early in the
plant’s life. That would
amount to the plant having
good intentions. However, if
unfavorable conditions turn
up thereafter, then the plant
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