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Minnesota Crop News > 2001-2008 Archives
September 4, 2003
Corn
Harvest 2003
D.R.
Hicks,Agronomy and Plant Genetics, University of Minnesota
Corn will
be mature and at harvestable moisture levels earlier this
year because of the dry weather. This gives the opportunity
for more field drying, which will reduce drying costs. However,
the dry weather stress has caused premature dying as the
plants have shut down and will likely result in increased
stalk lodging and ear droppage.
Corn will
normally dry approximately 3/4 to 1% per day during favorable
drying weather (sunny and breezy) during the early warmer
part of the harvest season from mid September through late
September. By early to mid October, dry-down rates will usually
drop to 1/2 to 3/4% per day. So with earlier maturity, there
is more time during the early part of the harvest season
when air temperatures are higher that will facilitate more
rapid drying rates. It may be possible to leave corn in the
field to dry to levels such that little to no drying will
be required. And with high LP gas costs and lower yields
due to the dry weather, saving drying costs will help to
preserve some profitability.
However,
the potential for higher field losses due to stalk lodging
and ear droppage is the tradeoff. The dry weather stress
has caused cannibalization of plant sugars from the stalk
to the grain leaving the stalks and ear shanks weakened and
predisposed to stalk rot development at an earlier calendar
date. The organisms that cause stalk rot also grow and develop
more quickly at higher temperatures, so the potential for
early stalk rot development exists.
Weakened
stalks and shanks could mean lodging and ear droppage, which
may slow harvest and increase harvest losses. The droppage
of one "normal" sized ear per 100 feet of row in
30 inch spaced rows equals a loss of 1 bushel per acre. Corn
growers should evaluate fields for ear droppage potential
and harvest those fields first that appear to have the greatest
potential for yield losses.
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