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Effects of Seed Age and Preplanting Seed Treatment on Seedling Response in Crested Wheatgrass¹

Seed lots of Nordan crested wheatgrass, Agropyron desertorum (Fisch. ex Link) Schult., of six ages were subjected to presoaking treatments on moist blotter paper, for periods ranging from 40 to 90 hr at 17.2 C, prior to greenhouse planting in soil. Seeds given preplanting treatments, and planted wet, produced seedlings which emerged ahead of those from untreated seeds, the hours of advantage in direct relation to the length of pretreatmerit, but drying before planting reduced the advantage. At 4 days after planting, pretreated seeds produced seedlings with longer roots and shoots than those from untreated seeds. Older seeds required more tinie to produce seedlings but the advantage from treatment was not altered by age of seed.

Key Words: Seed size • Viability • Seedling vigor • Root and shoot growth

² Range Scientist and Agronomist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Logan, Utah 84321.

Received for publication September 26, 1968.