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Effects of Repeated Herbicide Applications on Alfalfa (Medicago sativa)

Published online by Cambridge University Press:  12 June 2017

D. G. Swan
D. G. Swan*
Affiliation:
Dep. of Agron. and Soils, Washington State Univ., Pullman, WA 99164
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Abstract

Six herbicides, simazine [2-chloro-4,6-bis(ethylamino)-s-triazine], propham (isopropyl carbanilate), terbacil (3-tert-butyl-5-chloro-6-methyluracil), carbetamide [D-N-ethyllactamide carbanilate (ester)], pronamide [3,5-dichloro(N-1,1-dimethyl-2-propynyl)benzamide], and secbumeton [N-ethyl-6-methoxy-N′(1-methylpropyl)-1,3,5-triazine-2,4-diamine] were applied annually for four years to establish forage alfalfa (Medicago sativa L. ‘Washoe’). Downy brome (Bromus tectorum L.) control ranged from 80 to 100%. The average control of broadleaf weeds was 90 to 100% with simazine, terbacil, and secbumeton, compared to 30 to 40% with propham, carbetamide, and pronamide. Only simazine and terbacil were phytotoxic to the alfalfa. Based on weed control and crop tolerance, secbumeton performed best on the coarsetextured soil in this experiment.

Type
Research Article
Information
Weed Science , Volume 26 , Issue 2 , March 1978 , pp. 151 - 153
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

Literature Cited

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