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Weed Control Strategies for Forage Legumes

Published online by Cambridge University Press:  12 June 2017

Najib Malik  and
John Waddington
Najib Malik
Affiliation:
Res. Stn., Agric. Can., Box 1240, Melfort, Sask. SOE 1AO
John Waddington
Affiliation:
Res. Stn., Agric. Can., Box 1030, Swift Current, Sask. S9H 3X2
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Abstract

Tolerance and subsequent yield response of established alfalfa, red clover, alsike clover, sainfoin, birdsfoot trefoil, and cicer milkvetch to sethoxydim and fluazifop spring applied and to hexazinone, metribuzin, and terbacil fall applied were determined in a field study. All legumes tolerated sethoxydim. Fluazifop was safe on all legumes except sainfoin. Alfalfa and cicer milkvetch tolerated hexazinone, metribuzin, and terbacil. Alfalfa dry matter yield was not affected by any of the herbicide treatments, but cumulative cicer milkvetch yield increased 9% over a 3-yr period with hexazinone applications. Sainfoin yield increased 20% with hexazinone and terbacil treatment. Hexazinone injured red clover and reduced yield. Alsike clover was the most susceptible legume to the residual herbicides. Weed dry matter yield associated with the legumes indicated that alfalfa and sainfoin were the most and the least competitive species, respectively. Plots treated with hexazinone contained the least amount of weeds, regardless of the legume species. Field peas seeded in rotation was not affected by herbicide residues; however, residues from terbacil applied at 1.0 kg/ha reduced seed yield of lentils.

Keywords

Fluazifop, (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acid)hexazinone, 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4-(1H,3H)-dionemetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onesethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-oneterbacil, 5-chloro-3-(1,1-dimethylethyl)-6-methyl-2,4(1H,3H)-pyrimidinedione)alfalfa, Medicago sativa L. #4 MEDSAalsike clover, Trifolium hybridum L. # TRFHYbirdsfoot trefoil, Lotus corniculatus L. # LOTCOcicer milkvetch, Astragalus cicer L. # ASACIred clover, Trifolium pratense L. # TRFPRsainfoin, Onobrychis viciafolia Scop. # ONBVIAlfalfared cloveralsike cloversainfoinbirdsfoot trefoilcicer milkvetchfluazifophexazinonesethoxydimterbacilmetribuzin
Type
Research
Information
Weed Technology , Volume 3 , Issue 2 , June 1989 , pp. 288 - 296
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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