Faming, Saturday, February 10,1979
Natural air drying
(Continued from Page 95)
swer “many questions”
concerning “grain
Cbillcuring, which is a
patented process of con
ditioning shelled com during
which its moisture content is
reduced.”
The three professors
conclude that “Harvestall’s
‘Chillcuring’ is basically a
natural-air drying' system
with a very small amount of
additional energy added by
the infra-red lamps.”
“Natural-air drying is not
new,” say the Minnesota
professors. “Farmers use
natural-air drying to dry ear
com in cribs. Natural forces
(wind and sun) move enough
air through the com to dry it
before it spoils provided
there is a proper relationship
between crib width and com
moisture content, Natural
air can and is being used to
move enough air through the
shelled com to dry it before
it spoils,” they say.
Hicks, Cloud and Hard
man continue that “Much
research has been conducted
on the natural-air drying of
shelled com. Since the
spoilage rate and the amount
of water to be removed both
increase with com moisture
content, the quantity of air
required for natural air
drying of shelled com in
creases rapidly with in
creasing moisture content.
Research has shown that an
air flow of one cubic foot per
minute ' per bushel is
required to dry 21 to 22 per
cent moisture content
shelled com with natural air
in Minnesota. At 25 to 26 per
cent moisture content, the
air flow required increases
to three cubic feet per
bushel.
The professors’ primary
dispute comes with Har
vestall’s alleged claim that
their patented process will
bring about an increase in
dry weight. But they also
doubt that the system will
accomodate enough air
movement to dry grain
which contains more than 24
per cent moisture. The
professors claim that most
natural-air drying bins
(including Harvestall’s) are
limited by that factor.
“If com is being harvested
• at moisture contents above
this (21 to 24 per cent) the bin
must be filled at a slower
rate over a longer period of
time, so the higher moisture
com can be dried before it
spoils,” Hicks, Cloud, and
Hardman reported. “The
higher the moisture content
of the com, the slower the
bin must be filled to
minimize grain spoilage,
this is how any low tem
perature, layer, in-storage
drying system must be
managed to dry shelled com
successfully,” they add.
Hicks, Cloud and Hard
man . cite a 1975 ad
vertisement by Harvestall
Industries which illustrates
their disagreement with
company claims. The ad
vertisement allegedly was
entitled: “Back To Good
Grain” and reported a
situation where 11,325
bushels of grain went into
the bin at a moisture content
of 22.5 per cent, and 10,644
bushels at 14.5 per cent
moisture were sold from the
bin. From these figures, say'
the professors. One can
calculate that 18,130 more
pounds of,dry matter were
removed fom the bin that
originally contained the
corn.
They base their
disagreement on the
following calculation:
491,505 pounds of dry matter
(11,325 bushels x 56 pounds
per bushel x 77.5 per cent dry
matter) went into the bin
and 509*635 pounds of dry
matter (10,644 x 56 x 85.5)
were removed.
The three professors then
go on to cite a 1978 ad
vertisement titled “Har
vestall Gram Chillcuring”
which allegedly uses the
following example: “13,000
bushels at 27 per cent
moisture conditioned to
12,103 bushels at 15.5 per
cent by Harvestall
‘Chillcuring’.” Again, the
professors calculate that this
would mean 'more dry
matter coming out, than
what went into the bin. They
disagree that the
‘Chillcuring’ concept will do
that.
The University of Min
nesota paper, entitled
“Weight Shrink and Dry
Matter Change During
Drying and Storing' Com
Grain” contains five full
typewritten pages. Aside
from their own work, the
paper cites five other
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" sources , of ' information,
including C.M. Christensen
of the American Association
. of Cereal Chemists, St. Paul,
Minn.
Agricultural collegesliave
not run any teste on Steffen’s
system as far as he, knows.
He stands by teste which he
claims took place “on
thousands of farms.” Aside
from pronouncing that his
chill-cured system saves
energy - and preserves
quality, the Midwesterner
also says that feed
requirements are reduced
with his method.
Joe McCurdy, a crop
storage specialist at Penn
State University, says he
takes some exception to
claims made'by Harvestall
promoters. He says, simply,
that it is a system which
works fine, but it-has its
limitations. A major limiting
factor is the humifl climate
of the Northeast, which
takes away from the ef
ficiency of the concept, he
says. Point two is that he
isn’t convinced the idea is
efficient with corn placed'
into the bin at 20 per cent
moisture or above. Below
that, he says, it is feasible.
At any rate, he believes the
low-temperature ' drying
concept, as exemplified by-
Steffen’s product, is more
adaptable to the Midwest
(Turn to Page 97)
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