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Published in Crop Sci 11:515-518 (1971)
© 1971 Crop Science Society of America
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Test Weight in Relation to the Physical and Quality Characteristics of Soft Winter Wheat (Triticum aestivum L. em Thell)1

Ardeshir Ghaderi, E. H. Everson and W. T. Yamazaki2

Test weight is defined as the weight of grain that fills a given volume. It is the product of kernel density and volume of grain occupying the container. The latter component, when expressed as percentage of the volume of the container, is referred to as packing efficiency and was shown to be a cultivar characteristic. Of the two components packing efficiency has a greater effect on test weight when comparing soft winter wheats (Triticum aestivum L. em Thell).

There was a negative correlation between test weight and the kernel length-width ratio (kernel shape). When the length-width ratio remained constant, there was no increase in test weight when kernel volume increased. Kernel width was correlated more than length with kernel volume. Test weight and flour yield were not correlated within or among cultivars. Kernel protein was related to kernel size within cultivars.

Key Words: Kernel density • Packing efficiency • Flour yield • Plant breeding

1 Contribution from the Department of Crop and Soil Sciences, Michigan State University, East Lansing, Mich. and the Plant Science Research Division, Agricultural Research Service, U. S. Department of Agriculture, Michigan Agricultural Experiment Station Paper No. 5140. Supported in part by a grant from the Michigan State Millers, Soft White Wheat Processors and Shippers.

2 Formerly graduate assistant (now Assistant Professor, Department of Horticulture, Ghondi-Shahpoor, Ahwaz, Iran); Professor of Crop and Soil Sciences, Michigan State University, East Lansing, Mich. 48823; and Research Chemist, Plant Science Research Division, Agricultural Research Service, U. S. Department of Agriculture, Ohio Agricultural Research and Development Center, Wooster, Ohio 44697.

Received for publication November 20, 1970.




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