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Title:

PLANT GROWTH REGULATOR APPLICATION TIMING RESEARCH

Accession Number:

00457925

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/00978515

Abstract:

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.

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 20001 United States

Authors:

DiPaola, J M
Gilbert, W B
Lewis, W M

Pagination:

p. 11-12

Publication Date:

1986-7

Serial:

Transportation Research Circular

Issue Number: 307
Publisher: Transportation Research Board
ISSN: 0097-8515

Media Type:

Digital/other

Features:

Tables (1)

Uncontrolled Terms:

Timing

Old TRIS Terms:

Subject Areas:

Design; Environment; Highways; Maintenance and Preservation; Planning and Forecasting; Research; I21: Planning of Transport Infrastructure

Files:

TRIS, TRB

Created Date:

Sep 30 1986 12:00AM

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