About Us | Help Videos | Contact Us | Subscriptions

Members of ASA, CSSA, and SSSA: Due to system upgrades, your subscriptions in the digital library will be unavailable from May 15th to May 22nd. We apologize for any inconvenience this may cause, and thank you for your patience. If you have any questions, please call our membership department at 608-273-8080.


Institutional Subscribers: Institutional subscription access will not be interrupted for existing subscribers who have access via IP authentication, though new subscriptions or changes will not be available during the upgrade period. For questions, please email us at: queries@dl.sciencesocieties.org or call Danielle Lynch: 608-268-4976.



This article in CS

  1. Vol. 32 No. 6, p. 1377-1380
    Received: Dec 16, 1991

    * Corresponding author(s):
Request Permissions


Heading Synchrony and Yield Components of Barley Grown in Subarctic Environments

  1. Stephen M. Dofing  and
  2. Charles W. Knight
  1. P almer Res. Ctr., 533 E. Fireweed, Palmer, AK, 99645
    A gric. and Forestry Exp. Stn., Univ. of Alaska Fairbanks, Fairbanks, AK, 99775



Synchronous heading is an important characteristic of barley (Hordeum vulgare L.) grown in subarctic conditions, in which short growing seasons, cool temperatures, and the potential of early snowfall necessitate timely harvest. Kernels on late-developing spikes often fail to mature under these conditions, resulting in harvest delay and reduced grain quality. This study was conducted to determine the influence of seeding rate on heading synchrony and yield components of barley grown in subarctic environments. Three spring barley cultivars were evaluated at seeding rates of 22, 65, 108 kg ha−1 at Palmer and Fairbanks, AK, in 1990 and 1991. Heading synchrony was assessed by determining the range and standard deviation for the interval from sowing to spike appearance. for all cultivars at both locations, growing degree days (GDD) to spike appearance had a narrower range and a reduced standard deviation with higher seeding rates. Averaged across cultivars and environments, seeding rates of 22, 65, and 108 kg ha−1 resulted in standard deviations of GDD to spike appearance of 80, 68, and 64, respectively. Earliest maturity was obtained with the 108 kg ha−1 seeding rate, and grain yield was nearly identical to the 65 kg ha−1 rate. Increasing seeding rate from 65 to 108 kg ha−1 caused a greater compensatory decrease in kernels per spike than kernel weight. In similar environments, use of relatively high rates of seeding is recommended to reduce time to maturity, minimize number of late developing tillers, and optimize grain yield.

Contribution from the Agric. and Forestry Exp. Stn., Univ. of Alaska Fairbanks.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .