PLANT GROWTH REGULATOR APPLICATION TIMING RESEARCH

Examples are cited which show that growth regulator activity varies with the time of year, and most likely, with the stage of development of the plant. Field growth regulator application programs have been traditionally scheduled on a calendar date basis. However, it is shown that calendar date is an inaccurate reflection of the developmental stage of the grass seedhead. Studies are described which were designed to monitor the development of tall fescue seedheads and determine how seedhead suppression was affected by the inflorescence developmental stage. Excellent suppression of tall fescue seedheads was obtained using maleic hydrazide at 4-lb ai/acre applied between the initiation of inflorescence development and the point of rapid elongation of seedhead in late April and early May. Currently, the relationship between seedhead length, seedhead suppression and growing degree-days (GDD) is being examined as a possible practical approach to defining the activity periods of plant growth regulators. GDD analysis appears to be a practical approach to identifying growth regulator application windows for acceptable seedhead suppression of tall fescue.

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/trcircular/307/307-004.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00978515
• Supplemental Notes:
  • Paper presented to the Committee on Roadside Maintenance of the Transportation Research Board's Group 3 Council on Operation, Safety, and Maintenance of Transportation Facilities. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • DiPaola, J M
  • Gilbert, W B
  • Lewis, W M
• Publication Date: 1986-7

Media Info

• Media Type: Digital/other
• Features: Tables;
• Pagination: p. 11-12
• Serial:
  • Transportation Research Circular
  • Issue Number: 307
  • Publisher: Transportation Research Board
  • ISSN: 0097-8515

Subject/Index Terms

• TRT Terms: Applications; Grasses; Monitoring; Plants; Research; Seeds
• Uncontrolled Terms: Timing
• Old TRIS Terms: Fescue; Growth regulators
• Subject Areas: Design; Environment; Highways; Maintenance and Preservation; Planning and Forecasting; Research; I21: Planning of Transport Infrastructure;

Filing Info

• Accession Number: 00457925
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Sep 30 1986 12:00AM