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Effect of Herbicides on Alfalfa and Subsequent Crops

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, Washington 99163
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Abstract

Three herbicides, 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine), 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine), and 3-tert-butyl-5-chloro-6-methyluracil (terbacil), applied annually at 0.45, 0.90, and 1.80 kg/ha for 2 or 3 years to establish forage alfalfa (Medicago sativa L. ‘Ranger’), effectively controlled downy brome (Bromus tectorum L.), tumble mustard (Sisymbrium altissimum L.), and prickly lettuce (Lactuca serriola L.). However, downy brome control decreased to less than half and broadleaf control ceased 18 months after the final herbicide application. Atrazine injured alfalfa most. Usually, annual applications of 0.45 kg/ha did not reduce yield. Greenhouse and field bioassay data indicated that the herbicides leached below the 0 to 32.5 cm soil zone and persisted. Residues were absorbed by roots of crops planted 2 to 3 years after the last application. Injury was similar whether the last application was made 18 or 30 months previously. The order of crop tolerance was sweet corn (Zea mays L. ‘Rugosa’) > potatoes (Solarium tuberosum L. ‘Norgold’) > winter wheat (Triticum aestivum L. ‘Nugaines’) > bush beans (Phaseolus vulgaris L. ‘Humilis’) ≅ sugar beets (Beta vulgaris L. ‘U. & I. hybrid No. 8′).

Type
Research Article
Information
Weed Science , Volume 20 , Issue 4 , July 1972 , pp. 335 - 337
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

1. Gilkey, Helen M. 1957. Weeds of the Pacific Northwest. Oregon State College Press, Corvallis, Oregon. 441 p.Google Scholar
2. Hastings, R. E. and Kust, Cyril A. 1970. Control of yellow rocket and white cockle in established alfalfa. Weed Sci. 18:329–332.Google Scholar
3. Kust, Cyril A. 1969. Selective control of hoary alyssum in alfalfa. Weed Sci. 17:99–101.Google Scholar
4. Li, J. C. R. 1957. Introduction to statistical inference. Edward Brothers, Inc., Ann Arbor, Michigan. 553 p.CrossRefGoogle Scholar
5. Peters, R. A. and O'Leary, R. M. 1967. Herbicidal response of white cockle (Lychnis alba) and other winter weeds associated with alfalfa. Proc. Northeast. Weed Contr. Conf. 21:299–302.Google Scholar
6. Talbert, R. E. and Fletchall, O. H. 1964. Inactivation of simazine and atrazine in the field. Weeds 12:33–37.CrossRefGoogle Scholar