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Resistance of Seedlings to Frost Heaving Injury¹

Synopsis: Stem and leaf breakage were the major types of injury from frost heaving to 14-day old seedlings of Hardinggrass, Perennial ryegrass, and 2 winter wheats. The lower the injury on the plant, the less the chance for survival. Ryegrass was more resistant than Hardinggrass at plant lifts less than 10 mm. Wheats were more resistant than the grasses. Depth of planting adversely affected grass seedlings at a greater degree than with wheat, but shallower planting caused greater root injury than deep planting in both grasses and wheats.

² Formerly Graduate Assistant, University of California, now Agent (Plant Physiologist) Field Crops Research Branch, A.R.S.,U.S.D.A., and Instructor of Plant Breeding, Cornell University, Ithaca. New York.

Received for publication December 13, 1955.