Corn Moisture Measurement Accuracy

Date
1985
Authors
Bern, Carl
Hurburgh, Charles
Hurburgh, Charles
Hazen, T.
Bern, Carl
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Journal Issue
Series
Department
Agricultural and Biosystems Engineering
Abstract

The four electronic moisture meters most commonly used by Iowa grain dealers were compared with the official United States Department of Agriculture (USDA) air-oven method on 881 samples of corn from the 1979 and 1980 harvests. Samples ranged in moisture from 11% to 38%, wet basis. With the manufacturer-developed calibrations used in 1979, all four brands gave biased readings with respect to the air-oven method. Calibration bias errors differed among brands and ranged from approximately 1.5% to -3.5% moisture content. A recalibration between the 1979 and 1980 harvests reduced both this bias and the discrepancy among meter brands. Random errors originated from three sources: the electrical properties of different samples (contributing about 85% of the total random error), the repeatability of a meter test on a specific sample (contributing about 10%, and the repeatability of the oven method on a specific sample (contributing about 5%. The coefficient of variation of a meter test with respect to the oven varied with moisture content and increased from a minimum of 2.5% to 15.5% moisture corn to a maximum of 4.5% at both 11% and 38% moisture corn.

Comments

This article is from Transactions of the ASAE 28 (1985): 634–640. Posted with permission.

Description
Keywords
Citation
DOI
Source
Collections