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Germination and Emergence of selected Forage Species Following Preplanting Seed Treatment¹

Germination, seedling emergence, and initial root and shoot elongation were all hastened by preplanting treatments applied to the seeds of seven Agropyrons, Bromus tectorum L., and Elymus junceus Fisch. Preplanting treatments consisted of wetting the seeds at selected temperatures and periods. The best treatment for the Agropyrons and E. junceus was 60 hours at 16 C. The best treatfor B. tectorum was 30 hours at 16 C. Less consistent results were obtained from various preplanting treatments applied to the seeds of four summer growing grasses and one browse species. Five days after planting Eragrostis lehmanniana Nees had 6% emergence from controls and 13 to 31% from pretreated seeds. Sporobolus airoides (Torr.) Torr. emergence from controls was 3% and 35 to 53% from treated seeds. Atriplex canescens (Pursh) Nutt. given pretreatment at 28 C for 10 hours had roots averaging 30 mm longer than the control. We obtained no measurable response to preplanting treatments from Bouteloua curtipendula (Michx.) Torr. or B. eriopoda (Torr.)

Key Words: Root elongation • Temperature • Cool-season grases • Summer growing grasses • Browse species

² Range Scientist and Agronomist, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, Logan, Utah 84321.

Received for publication April 14, 1971.