World Grain - November 2020 - 56

GRAIN OPERATIONS

Grain storage management
at your fingertips
Free smartphone app serves as an engineering
tool for storage and aeration processes
by Dirk Maier and Ricardo Bartosik

After earlier concerns about a potential late harvest and higher-than-normal moisture contents, the harvest of corn (maize)
and soybeans in 2020 in Iowa and across the midwestern US
was completed rather quickly and resulted in better grain
quality than expected. In Central Iowa, many farmers and
commercial grain handlers never turned on their grain dryers
because corn came off the fields well below the market moisture content of 15%. Similarly, soybeans were generally lower
than the market moisture content of 13%. Thus, crops should
store well into the new marketing year.
The reason for this change in harvest conditions was warm,
dry weather accompanied by steady winds that caused substantial drying in the field. Field drying is similar to natural (or
ambient) air drying in silos (or flat storage structures) except
that corn is on the ear and soybeans are in the pods. Knowing
the air-grain moisture relationship for specific conditions will
give an indicator as to the moisture content grain will equilibrate toward over time when exposed to certain air temperature and relative humidity conditions whether in a field or in a
silo. For example, ear corn will equilibrate to 14.3% moisture
content when air temperature is 25°C (77°F) and relative humidity is 70%. When relative humidity reduces to 50%, ear
corn will equilibrate to 11.6%. Under the same conditions,
soybeans will equilibrate to 13.3% and 8.6%, respectively.
In the past, these air-grain moisture relationships had to be
looked up in charts, handbooks and extension publications.
More recently, one can find them on the internet with the right
combination of search terms. Neither is as convenient as having them in an app on your smart phone. Now such an app
adding intelligence for stored grain management at your fingertips is finally available.
OVERVIEW OF THE GRAIN AERATION AND STORAGE APP
The app is currently only available for the Android platform
and may be found in the Google Play Store with the search term
"Grain Aeration & Storage." It will display with the following
symbol: The programmer name is Maximiliano Batelli. The most
current version as of this writing is 1.4 updated on Oct. 15.
This app is intended to serve as an engineering tool for grain
56	

WG_Nov20.indb 56

storage and aeration processes. It was jointly developed by
the co-authors of this article representing the Grain Postharvest Group located at the Experimental Research Station of
INTA Balcarce, Argentina, and the Post-Harvest Engineering
and Feed Technology Group of the Department of Agricultural and Biosystems Engineering and the Iowa Grain Quality
Initiative at Iowa State University.
The base settings of the app (Screenshot 1, page 60) allow
the user to choose among four interface languages (English,
Spanish, Portuguese, French), metric or imperial units, and
whether to use the smartphone's GPS function to find a weather station within a certain distance of the current location.
When the GPS function is turned off, the user has the flexibility to enter any geographic location in the world and use
the app tools for grain stored based on that location's weather
forecast. The app has the option to select among five common
weather forecast platforms to give the user flexibility in case
one is preferred over another, or perhaps one is unavailable at
a particular geographic location in the world.
The app allows the user to choose from among 26 different grain types, including cereals (barley, oats, wheat), coarse
grains (corn/maize, popcorn, sorghum), oilseeds (soybeans,
sunflower, rapeseed, safflower), expelled soybeans, edible
beans, rice, and shelled peanuts. For each grain type, the user
can view the model equation and grain-specific parameters as
well as the scientific reference source.
The app consists of three tools that are described in detail
in the following sections. Additionally, a related podcast is
available at https://www.extension.iastate.edu/grain/grainaeration-storage-app-released
AIR-GRAIN MOISTURE RELATIONSHIPS
This tool calculates the Equilibrium Moisture Content (EMC),
Equilibrium Relative Humidity (ERH), and recommended
Safe Storage Moisture Content (SSMC) for different grain
types and air conditions. It indicates whether certain air conditions (ambient, heated, refrigerated/chilled) are suitable to
achieve a stored grain manager's goal for lowering, maintaining, or increasing moisture content.
November 2020 / World Grain / www.World-Grain.com

11/2/2020 4:15:42 PM


https://www.extension.iastate.edu/grain/grain http://www.World-Grain.com

World Grain - November 2020

Table of Contents for the Digital Edition of World Grain - November 2020

World Grain - November 2020 - 1
World Grain - November 2020 - 1
World Grain - November 2020 - 2
World Grain - November 2020 - 3
World Grain - November 2020 - 4
World Grain - November 2020 - 5
World Grain - November 2020 - 6
World Grain - November 2020 - 7
World Grain - November 2020 - 8
World Grain - November 2020 - 9
World Grain - November 2020 - 10
World Grain - November 2020 - 11
World Grain - November 2020 - 12
World Grain - November 2020 - 13
World Grain - November 2020 - 14
World Grain - November 2020 - 15
World Grain - November 2020 - 16
World Grain - November 2020 - 17
World Grain - November 2020 - 18
World Grain - November 2020 - 19
World Grain - November 2020 - 20
World Grain - November 2020 - 21
World Grain - November 2020 - 22
World Grain - November 2020 - 23
World Grain - November 2020 - 24
World Grain - November 2020 - 25
World Grain - November 2020 - 26
World Grain - November 2020 - 27
World Grain - November 2020 - 28
World Grain - November 2020 - 29
World Grain - November 2020 - 30
World Grain - November 2020 - 31
World Grain - November 2020 - 32
World Grain - November 2020 - 33
World Grain - November 2020 - 34
World Grain - November 2020 - 35
World Grain - November 2020 - 36
World Grain - November 2020 - 37
World Grain - November 2020 - 38
World Grain - November 2020 - 39
World Grain - November 2020 - 40
World Grain - November 2020 - 41
World Grain - November 2020 - 42
World Grain - November 2020 - 43
World Grain - November 2020 - 44
World Grain - November 2020 - 45
World Grain - November 2020 - 46
World Grain - November 2020 - 47
World Grain - November 2020 - 48
World Grain - November 2020 - 49
World Grain - November 2020 - 50
World Grain - November 2020 - 51
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World Grain - November 2020 - 53
World Grain - November 2020 - 54
World Grain - November 2020 - 55
World Grain - November 2020 - 56
World Grain - November 2020 - 57
World Grain - November 2020 - 58
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http://digital.world-grain.com/sosland/wg/2020_11_01
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http://digital.world-grain.com/sosland/wg/2020_02_01
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http://digital.world-grain.com/sosland/wg/2019_07_01
http://digital.world-grain.com/sosland/wg/2019_06_01
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https://www.nxtbook.com/sosland/wg/2017_12_01
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https://www.nxtbook.com/sosland/wg/2017_09_01
https://www.nxtbook.com/sosland/wg/2017_08_01
https://www.nxtbook.com/sosland/wg/2017_07_01
https://www.nxtbook.com/sosland/wg/2017_06_01
https://www.nxtbook.com/sosland/wg/2017_05_01
https://www.nxtbook.com/sosland/wg/2017_04_01
https://www.nxtbook.com/sosland/wg/2017_03_01
https://www.nxtbook.com/sosland/wg/2017_02_01
https://www.nxtbook.com/sosland/wg/2017_01_01
https://www.nxtbook.com/sosland/wg/2016_12_01
https://www.nxtbook.com/sosland/wg/2016_11_01
https://www.nxtbook.com/sosland/wg/2016_10_01
https://www.nxtbook.com/sosland/wg/2016_09_01
https://www.nxtbook.com/sosland/wg/2016_08_01
https://www.nxtbook.com/sosland/wg/2016_07_01
https://www.nxtbook.com/sosland/wg/2016_06_01
https://www.nxtbook.com/sosland/wg/2016_05_01
https://www.nxtbook.com/sosland/wg/2016_04_01
https://www.nxtbook.com/sosland/wg/2016_03_01
https://www.nxtbook.com/sosland/wg/2016_02_01
https://www.nxtbook.com/sosland/wg/2016_01_01
https://www.nxtbook.com/sosland/wg/2015_12_01
https://www.nxtbook.com/sosland/wg/2015_11_01
https://www.nxtbook.com/sosland/wg/2015_10_01
http://digital.world-grain.com/sosland/wg/2015_09_01
http://digital.world-grain.com/sosland/wg/2015_08_01
http://digital.world-grain.com/sosland/wg/2015_07_01
http://digital.world-grain.com/sosland/wg/2015_06_01
http://digital.world-grain.com/sosland/wg/2015_05_01
https://www.nxtbook.com/sosland/wg/2015_04_01
https://www.nxtbook.com/sosland/wg/2015_03_01
https://www.nxtbook.com/sosland/wg/2015_02_01
http://digital.world-grain.com/sosland/wg/2015_01_01
https://www.nxtbook.com/sosland/wg/2014_12_01
https://www.nxtbook.com/sosland/wg/2014_11_01
https://www.nxtbook.com/sosland/wg/2014_10_01
https://www.nxtbook.com/sosland/wg/2014_09_01
https://www.nxtbook.com/sosland/wg/2014_08_01
https://www.nxtbook.com/sosland/wg/2014_07_01
https://www.nxtbook.com/sosland/wg/2014_06_01
https://www.nxtbook.com/sosland/wg/2014_05_01
https://www.nxtbook.com/sosland/wg/2014_04_01
https://www.nxtbook.com/sosland/wg/2014_03_01
https://www.nxtbook.com/sosland/wg/2014_02_01
https://www.nxtbook.com/sosland/wg/2014_01_01
https://www.nxtbook.com/sosland/wg/2013_12_01
https://www.nxtbook.com/sosland/wg/2013_11_01
https://www.nxtbook.com/sosland/wg/2013_10_01
https://www.nxtbook.com/sosland/wg/2013_09_01
https://www.nxtbook.com/sosland/wg/2013_08_01
https://www.nxtbook.com/sosland/wg/2013_07_01
https://www.nxtbook.com/sosland/wg/2013_06_01
https://www.nxtbook.com/sosland/wg/2013_05_01
https://www.nxtbook.com/sosland/wg/2013_04_01
https://www.nxtbook.com/sosland/wg/2013_03_01
https://www.nxtbook.com/sosland/wg/2013_02_01
https://www.nxtbook.com/sosland/wg/2013_01_01
https://www.nxtbook.com/sosland/wg/2012_12_01
https://www.nxtbook.com/sosland/wg/2012_11_01
https://www.nxtbook.com/sosland/wg/2012_10_01
https://www.nxtbook.com/sosland/wg/2012_09_01
https://www.nxtbook.com/sosland/wg/2012_08_01
https://www.nxtbook.com/sosland/wg/2012_07_01
https://www.nxtbook.com/sosland/wg/2012_06_01
https://www.nxtbook.com/sosland/wg/2012_05_01
https://www.nxtbook.com/sosland/wg/2012_04_01
https://www.nxtbook.com/sosland/wg/2012_03_01
https://www.nxtbook.com/sosland/wg/2012_02_01
https://www.nxtbook.com/sosland/wg/2012_01_01
https://www.nxtbook.com/sosland/wg/2011_12_01
https://www.nxtbook.com/sosland/wg/2011_11_01
https://www.nxtbook.com/sosland/wg/2011_10_01
https://www.nxtbook.com/sosland/wg/20111_09_01
https://www.nxtbook.com/sosland/wg/2011_08_01
https://www.nxtbook.com/sosland/wg/2011_07_01
https://www.nxtbook.com/sosland/wg/2011_06_01
https://www.nxtbook.com/sosland/wg/2011_05_01
https://www.nxtbook.com/sosland/wg/2011_04_01
https://www.nxtbook.com/sosland/wg/2011_03_01
http://digital.world-grain.com/sosland/wg/2011_02_01
http://digital.world-grain.com/sosland/wg/2011_02_01
http://digital.world-grain.com/sosland/wg/2011_01_01
http://digital.world-grain.com/sosland/wg/2010_12_01
http://digital.world-grain.com/sosland/wg/2010_11_01
http://digital.world-grain.com/sosland/wg/2010_10_01
http://digital.world-grain.com/sosland/wg/2010_09_01
http://digital.world-grain.com/sosland/wg/2010_08_01
http://digital.world-grain.com/sosland/wg/2010_07_01
http://digital.world-grain.com/sosland/wg/2010_06_01
http://digital.world-grain.com/sosland/wg/2010_05_01
http://digital.world-grain.com/sosland/wg/2010_04_01
http://digital.world-grain.com/sosland/wg/2010_03_01
http://digital.world-grain.com/sosland/wg/2010_02_01
http://digital.world-grain.com/sosland/wg/2010_01_01
http://digital.world-grain.com/sosland/wg/2009_12_01
http://digital.world-grain.com/sosland/wg/2009_11_01
http://digital.world-grain.com/sosland/wg/2009_10_01
http://digital.world-grain.com/sosland/wg/2009_09_01
http://digital.world-grain.com/sosland/wg/2009_08_01
http://digital.world-grain.com/sosland/wg/2009_07_01
http://digital.world-grain.com/sosland/wg/2009_06_01
http://digital.world-grain.com/sosland/wg/2009_05_01
http://digital.world-grain.com/sosland/wg/2009_04_01
http://digital.world-grain.com/sosland/wg/2009_03_01
http://digital.world-grain.com/sosland/wg/2009_02_01
http://digital.world-grain.com/sosland/wg/2009_01_01
http://digital.world-grain.com/sosland/wg/2008_12_01
http://digital.world-grain.com/sosland/wg/2008_11_01
http://digital.world-grain.com/sosland/wg/2008_10_01
http://digital.world-grain.com/sosland/wg/2008_09_01
http://digital.world-grain.com/sosland/wg/2008_08_01
http://digital.world-grain.com/sosland/wg/2008_07_01
http://digital.world-grain.com/sosland/wg/2008_06_01
http://digital.world-grain.com/sosland/wg/2008_05_01
http://digital.world-grain.com/sosland/wg/2008_04_01
http://digital.world-grain.com/sosland/wg/2008_03_01
http://digital.world-grain.com/sosland/wg/2008_02_01
http://digital.world-grain.com/sosland/wg/2008_01_01
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http://digital.world-grain.com/sosland/wg/2007_09_01
http://digital.world-grain.com/sosland/wg/2007_08_01
http://digital.world-grain.com/sosland/wg/2007_07_01
http://digital.world-grain.com/sosland/wg/2007_06_01
http://digital.world-grain.com/sosland/wg/2007_05_01
http://digital.world-grain.com/sosland/wg/2007_04_01
http://digital.world-grain.com/sosland/wg/2007_03_01
http://digital.world-grain.com/sosland/wg/2007_02_01
http://digital.world-grain.com/sosland/wg/2007_01_01
http://digital.world-grain.com/sosland/wg/2006_12_01
http://digital.world-grain.com/sosland/wg/2006_11_01
http://digital.world-grain.com/sosland/wg/2006_10_01
http://digital.world-grain.com/sosland/wg/2006_09_01
http://digital.world-grain.com/sosland/wg/2006_08_01
http://digital.world-grain.com/sosland/wg/2006_07_01
http://digital.world-grain.com/sosland/wg/2006_06_01
http://digital.world-grain.com/sosland/wg/2006_05_01
http://digital.world-grain.com/sosland/wg/2006_04_01
http://digital.world-grain.com/sosland/wg/2006_03_01
http://digital.world-grain.com/sosland/wg/2006_02_01
http://digital.world-grain.com/sosland/wg/2006_01_01
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http://digital.world-grain.com/sosland/wg/2005_11_01
http://digital.world-grain.com/sosland/wg/2005_10_01
http://digital.world-grain.com/sosland/wg/2005_09_01
http://digital.world-grain.com/sosland/wg/2005_08_01
http://digital.world-grain.com/sosland/wg/2005_07_01
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http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_01
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