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A Method for Simulating Subsurface Disposal of Herbicides

Published online by Cambridge University Press:  12 June 2017

J.M. Cupello ,
A.L. Young  and
J.C.H. Smith
J.M. Cupello
Affiliation:
U.S. Air Force Academy, CO 80840
A.L. Young
Affiliation:
U.S. Air Force Academy, CO 80840
J.C.H. Smith
Affiliation:
U.S. Air Force Academy, CO 80840
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Abstract

Specially designed growth boxes were used to simulate field subsurface injection of phenoxy herbicides. Sorghum (Sorghum vulgare Pers.) seedlings were grown in stainless steel containers (inserts) which were placed in plexiglass boxes containing a soil layer that had received 2,240 kg/ha of a 50:50 mixture of the n-butyl esters of 2,4-D [(2,4-dichlorophenoxy)-acetic acid] and 2,4,5-T [(2,4,5-trichlorophenoxy)-acetic acid]. Plant height data were collected periodically for all treatments. Subsurface herbicide application to both intact and cut root systems significantly altered root growth. Plants with treated, intact root systems showed retarded growth which became more pronounced with time. Plants whose root systems were treated, and cut on day 22, showed an initial acceleration of growth; a trend which eventually reversed itself and resulted in control plant height exceeding that of treated plants.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 4 , July 1977 , pp. 368 - 372
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

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