The Rural Voice, 1991-12, Page 50ADVICE
PROPER AERATION
ENSURES QUALITY
CORN LATER
More grain and oilseeds crops will
be stored this winter as prices are in the
doldrums. It is critical to ensure proper
aeration to prevent spoilage, especially
for corn.
Corn must be stored at a moisture
level of 15.5 per cent. As the bin is
filled, the incoming grain probably var-
ies in temperature and moisture content
because of changes in grain maturity,
weather conditions, and drying fluctua-
tions.
Hot spoiled areas may occur, even if
the moisture level in corn was low,
because, as winter approaches, large
temperature differences will occur be-
tween the corn on the outside of the bin
and the centre of the bin. Air convection
currents will be caused, and as the air
rises in the centre of the bin, it will
warm, increase its moisture holding
capacity, and pick up more moisture.
However, as the air reaches the top of the
bin, the reverse happens, and the mois-
ture is dropped at the top centre of the
bin where potential spoilage may occur.
In the spring season, the outside
temperature rises, and the opposite air-
flow will occur because of the higher
ambient temperature.
The corn should be aerated as soon
as possible after being placed in storage.
Continue cooling in steps until corn is
between 0°C and -5°C. Periodically
aerate the crop during the winter, espe-
cially during large temperature fluctua-
tions. In spring, the com needs to be
warmed to prevent convection airflow
from occurring and spoiling the stored
crop.
A factsheet entitled "Grain Aera-
tion" is available from your local
OMAF office. Remember, protect your
investment by proper aeration in the
upcoming months.°
Pat Kuntz
farm management specialist
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DECEMBER 1991 47