Department of Plant Science
Larger small-grain seeds have greater yield potential at planting time than do smaller seeds of the same variety.
The yield advantage of larger seeds has been positively correlated with early season growth. Mainly, plants from larger seeds produce more tillers, and thus additional seed heads per plant.
Small-grain seed size depends on variety, year of production, environment, and management practices. Consequently, it pays to check size each planting time. Wheat, oats, and barley yields can increase from 2 to 15%, depending on crop and the original seed lot quality, after sizing.
small grain seed size effects on crop yield
South Dakota Experiment Station, South Dakota State University
Gutormson, T. J. and Hall, R. G., "Small Grains: Seed size" (1989). Research Bulletins of the South Dakota Agricultural Experiment Station (1887-2011). 711.