About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in CS

  1. Vol. 36 No. 1, p. 98-104
     
    Received: Feb 20, 1995


    * Corresponding author(s): lgibson@ksu.edu
 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2135/cropsci1996.0011183X003600010018x

Influence of Day and Night Temperature on Soybean Seed Yield

  1. L. R. Gibson  and
  2. R. E. Mullen
  1. D ep. of Agronomy, Throckmorton Hall, Kansas State Univ., Manhattan, KS 66506
    D ep. of Agronomy, Agronomy Hall, Iowa State Univ., Ames, IA 50011

Abstract

Abstract

Growth temperature influences the seed yield of soybean [Glycinemax (L.) Merr.]. Most studies have concentrated on the effects of concomitant increases in day/night temperature during the entire life cycle of soybean. A better understanding of the influence of combinations of high day and night temperature imposed during different reproductive growth phases on soybean seed yield would be beneficial in identifying yield limiting factors. Day/night temperatures of 30/20, 30/30, 35/20, and 35/30°C were imposed during flowering and pod set (R1-R5), seed fill and maturation (R5-R8), and during the entire reproductive period (R1-R8). Increases in day temperature resulted in decreased seed formation when plants were exposed during flowering and pod set and decreased seed growth when exposed during flowering and pod set or seed fill. Seed growth reductions in plants exposed to the high day temperature were accompanied by decreased photosynthetic rates. The largest yield reduction in this study was 27% and occurred when 35°C occurred for 10 h per day from flowering to maturity. No significant losses in yield occurred at high night temperature at any reproductive growth phase. The only significant interaction between day and night temperature for the yield components was for seed weight per plant during flowering and pod set. Night temperature stress did not occur at 30°C and a night temperature of 20°C did not reduce the yield loss from daytime high temperature stress. This study suggests that soybean seed yield reductions from high temperatures are primarily a response to day temperature and moderate to high night temperatures have a small affect on soybean seed yield components.

Contribution as Journal Paper No. J-16045 of the Iowa Agric. and Home Econ. Exp. Stn., Ames; Project No. 2775

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

Copyright © .