RNGR.net is sponsored by the USDA Forest Service and Southern Regional Extension Forestry and is a colloborative effort between these two agencies.

U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Skip to content. | Skip to navigation

Home → Publications → Tree Planters' Notes → Tree Planters' Notes Volume 19, Number 3 (1968) → Are Alternating Temperatures More Beneficial Than Constant Temperatures During Stratification of Yellow Poplar Seed?

Are Alternating Temperatures More Beneficial Than Constant Temperatures During Stratification of Yellow Poplar Seed?

A study by Boyce and Hosner (1963) indicated that moist storage of yellow poplar (Liriodendron tulipifera L.) samaras at alternating weekly temperatures of 36 and 54° F. for 26 weeks resulted in 100-percent germination of viable seed within 9 weeks after sowing. Storage at continuous 36° F. and alternating weekly temperatures of 25° and 54° F. resulted in germination of viable seed of 75 and 65 percent, respectively. Storage at alternating weekly temperatures of 36° and 70° F. resulted in 100- percent germination of viable seed. However, germination began under this temperature regime during the 13th week of storage and was complete by the 24th week. Three other storage regimes tested included temperatures below freezing. In each treatment, some seed apparently was killed by freezing.


Download this file:

PDF document Download this file — PDF document, 112Kb

Details

Author(s): R. E. Adams

Publication: Tree Planters' Notes - Volume 19, Number 3 (1968)

Volume: 19

Number: 3