Growth and Development of Hardy and Nonhardy Wheat Varieties (Triticum aestivum L.) at Near‐freezing Temperatures¹

Abstract

Brevor and Lemhi wheat varieties (Triticum aestivum L.) were examined for growth and/or development during the winter months of 1968‐69. This activity was compared to the temperature environments of the air, plants, and soil, and to existing snow cover. Particular interest was given to processes occurring at near‐freezing temperatures. Both varieties showed slow though significant growth and development at near‐freezing temperatures when evaluated for root, leaf, and tiller number and for leaf area. The stage of development when subjected to low temperatures apparently determined the extent to which the varieties progressed. Underestablishment seemed most detrimental. Field mice showed a strong preference for the winter‐hardy Brevor.