Publication no. C-2002-0204-03R |  VIEW ARTICLE

Prediction of Test Weight from a Small Volume Specific Gravity Measurement.

J. R. Donelson (1), C. S. Gaines (1,2), L. C. Andrews (1), and P. F. Finney (1). (1) U.S. Department of Agriculture, Agricultural Research Service, Soft Wheat Quality Laboratory, Ohio Agricultural Research and Development Center, Ohio State University, Wooster, OH 44691. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable. (2) Corresponding author. E-mail: <gaines.31@osu.edu> Cereal Chem. 79(2):227-229. Accepted Ocober 31, 2001. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. American Association of Cereal Chemists, Inc., 2002

The specific gravity (cm(^3)/g) of small (20 and 40 g) samples of soft wheats from three states were rapidly measured and compared with bulk density (g/cm(^3)) measurements (microtest weights). Specific gravities were correlated with test weights for both cleaned and uncleaned samples. The relationship between specific gravity and test weight was linear unless the samples were severely shriveled. Operator effect was not statistically significant. Simple linear regression analysis produced equations that predicted with high R(^2) value microtest weights from specific gravity measurements. Both 20 and 40 g sample sizes were satisfactory. However, 40 g samples produced better statistical relationships.