Pack Factor Measurements for Corn in Grain Storage Bins

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dc.contributor.author Bhadra, Rumela
dc.contributor.author Turner, Aaron P.
dc.contributor.author Casada, Mark E.
dc.contributor.author Montross, Michael D.
dc.contributor.author Thompson, Sidney A.
dc.contributor.author Boac, Josephine M.
dc.contributor.author McNeill, Samuel G.
dc.contributor.author Maghirang, Ronaldo G.
dc.date.accessioned 2015-09-21T18:17:24Z
dc.date.available 2015-09-21T18:17:24Z
dc.identifier.uri http://hdl.handle.net/2097/20439
dc.description.abstract Shelled yellow corn is commonly stored in concrete or corrugated steel bins. Granular materials compact under their own weight, primarily due to particle rearrangement, leading to an increase in bulk density and a change in volume when stored. Reliable grain pack factors are needed to estimate storage capacities and to accurately monitor grain inventories. A science-based model (WPACKING) of pack factors is available that uses the differential form of Janssen’s equation and takes into account the variation in density caused by pressure variation with height and moisture content of the grain and accounts for the effects of grain type, test weight, bin geometry, and bin material. However, this model needs to be compared to field data over a wide range of conditions to ensure robust prediction accuracy. The objective of this research was to determine the field pack factors and bin capacities for on-farm and commercial bins used to store corn in the U.S. and compare them to predictions of the WPACKING program. Bin inventory measurements were conducted in concrete bins with depths up to 31.4 m (114.8 ft) and corrugated steel bins with diameters up to 32.8 m (156Â ft). These values were also compared to the techniques used by the USDA Risk Management Agency (RMA) and the USDA Farm Service Agency, Warehouse Branch (FSA-W). The differences between predicted and reported mass were -4.54% (maximum underprediction) to +4.53% (maximum overprediction) for WPACKING, -2.69% to 4.97% for the RMA method, and -3.33% to + 5.67% for the FSA-W method. The absolute average difference was lowest for the WPACKING model (0.90%) compared to the RMA and FSA-W methods (1.61% and 1.86%, respectively). WPACKING had less than half as many prediction differences above 1% (13 out of 51 bins) as did the RMA and FSA-W methods, which had 29 out of 51 and 33 out of 51, respectively. The RMA and FSA-W methods do not take into account the variations in pack factor due to bin type and moisture content of the stored grain. en_US
dc.language.iso en_US en_US
dc.publisher Transactions of the ASABE en_US
dc.relation.uri https://doi.org/10.13031/trans.58.11033 en_US
dc.rights This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). en_US
dc.rights.uri http://rightsstatements.org/vocab/InC/1.0/ en_US
dc.subject Commercial bin measurement en_US
dc.subject Laser distance meter en_US
dc.subject Steel and concrete bins en_US
dc.subject Stored grain pack factor en_US
dc.subject WPACKING en_US
dc.subject Corn, FSA, RMA en_US
dc.title Pack Factor Measurements for Corn in Grain Storage Bins en_US
dc.type Article (publisher version) en_US
dc.date.published 2015 en_US
dc.citation.doi 10.13031/trans.58.11033 en_US
dc.citation.epage 890 en_US
dc.citation.issn 0001-2351 en_US
dc.citation.issue 3 en_US
dc.citation.jtitle Transactions of the ASABE en_US
dc.citation.spage 879 en_US
dc.citation.volume 58 en_US
dc.contributor.authoreid rbhadra en_US
dc.contributor.authoreid casada
dc.contributor.authoreid jmboac
dc.contributor.authoreid rmaghir


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This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). Except where otherwise noted, the use of this item is bound by the following: This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

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