About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in AJ

  1. Vol. 81 No. 6, p. 951-954
     
    Received: Oct 7, 1988


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2134/agronj1989.00021962008100060021x

Ethephon and Nitrogen Use in Winter Wheat

  1. D. A. Van Sanford ,
  2. J. H. Grove,
  3. L. J. Grabau and
  4. C. T. MacKown
  1. USDA-ARS and Dep. of Agronomy, University of Kentucky, Lexington, KY 40546-0091.

Abstract

Abstract

The plant growth regulator ethephon ([2-chloroethyl] phosphoric acid) has often been used to reduce height and lodging of intensively managed soft red winter (SRW) wheat [Triticum aestivum (L.) em. Thell]. The effect of ethephon on traits that determine grain yield has not been widely studied. This study was conducted to determine whether ethephon alters N use and other yield-related traits in SRW wheat. Nine SRW cultivars were evaluated for 2 yr near Lexington, KY on a Maury silt loam (fine, mixed, mesic Typic Paleudalf). Lodging was negligible in both years. Total plant N at anthesis was significantly increased in plots treated with ethephon at Feekes growth stage (GS) 6 (12%) or GS 9 (15%). Similarly, dry matter (DM) at anthesis was increased 9 and 11% when ethephon was applied at GS 6 and 9, respectively. However, neither total N nor DM at maturity was significantly altered by ethephon application. Remobilization of vegetative N was increased 13% in ethephontreated plots. Ethephon applied at either GS increased the relative importance of N uptake efficiency vs. N partitioning efficiency in determining cultivar variation in N use efficiency. Application of ethephon did not alter grain yield, harvest index, or N harvest index. Ethephon had little or no influence on rate and duration of kernel growth, and slightly decreased kernel size (4%) when applied at GS 6. We conclude that ethephon has a minimal effect on the yield-determining traits evaluated in this study. However, the pronounced effect of ethephon on the nature of cultivar differences in N use efficiency warrants further study.

Contribution from the Dep. of Agronomy, Kentucky Agric. Exp. Stn. Lexington, KY. This paper (88—3—143) is published with the approval of the director.

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

Copyright © .