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Soil Incorporation and Site of Uptake of Preemergence Herbicides

Published online by Cambridge University Press:  12 June 2017

Ellery L. Knake ,
Arnold P. Appleby  and
William R. Furtick
Ellery L. Knake
Affiliation:
Department of Agronomy, University of Illinois, Urbana, Illinois
Arnold P. Appleby
Affiliation:
Department of Farm Crops, Oregon State University, Corvallis, Oregon
William R. Furtick
Affiliation:
Department of Farm Crops, Oregon State University, Corvallis, Oregon
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Abstract

Soil incorporation and site of uptake of preemergence herbicides was investigated under greenhouse conditions using green foxtail (Setaria viridis (L.) Beauv.) and the herbicides 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine), 2-chloro-N-isopropylacetanilide (hereinafter referred to as CP31393), 3-amino-2,5-dichlorobenzoic acid (amiben), 3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea (linuron), ethyl N,N-dipropylthiolcarbamate (EPTC), and α,α,α-trifluroro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin). As depth of incorporation of most herbicides was increased, control of green foxtail decreased, indicating a dilution effect. Subsurface application of herbicides at a 2-in depth generally was less than half as effective as surface application or shallow incorporation.

With three different moisture conditions, shallow incorporation of trifluralin to depth of 1 in was beneficial at all moisture levels. Shallow incorporation of atrazine and EPTC improved effectiveness under conditions analagous to furrow irrigation but not under conditions simulating moderate or high rainfall immediately after application. Shallow incorporation of the ammonium salt of amiben increased effectiveness significantly under high moisture but decreased effectiveness under low moisture. Effectiveness of linuron was reduced by incorporation under moderate and high moisture. Shallow incorporation did not significantly affect results with CP31393 under any moisture condition.

For the six herbicides tested, the expression of lethal action on tops of green foxtail was evident when herbicide was placed in the shoot zone but not when placed in the root zone during the 2-week period after seeding.

Type
Research Article
Information
Weeds , Volume 15 , Issue 3 , July 1967 , pp. 228 - 232
Copyright
Copyright © 1967 Weed Science Society of America 

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References

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