Prediction of test weight from a small volume specific gravity measurement

Abstract

The specific gravity (CM3/g) of small (20 and 40 g) samples of soft wheats from three states were rapidly measured and compared with bulk density (g/cm3) 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 R2 value microtest weights from specific gravity measurements. Both 20 and 40 g sample sizes were satisfactory. However, 40 g samples produced better statistical relationships.