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Alfalfa (Medicago sativa) Seed Yield Response to Herbicides

Published online by Cambridge University Press:  12 June 2017

Najib Malik  and
John Waddington
Najib Malik
Affiliation:
Melfort, Sask. SOE 1A0, and Swift Current, Sask. S9H 3X2
John Waddington
Affiliation:
Melfort, Sask. SOE 1A0, and Swift Current, Sask. S9H 3X2
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Abstract

Seedling alfalfa was injured by chlorsulfuron and sethoxydim plus 2,4-DB but recovered the following year as alfalfa seed yields were comparable to the hand-weeded control. Fluazifopbutyl and flamprop-methyl (active isomer) at 0.5 kg/ha did not affect seedling alfalfa adversely; however, seed yields were lower the following year compared to those treated at the 0.25-kg/ha rate. In established alfalfa, sethoxydim alone or with 2,4-DB applied annually did not affect seed yields adversely. However, 2,4-DB alone reduced seed yields in 2 of 5 yr. Alfalfa tolerated chlorsulfuron at 0.015 kg/ha but was damaged at the 0.03-kg/ha rate. Initial injury and later recovery without adverse effects on seed yield also were observed following annual treatments with bromoxynil, MCPA plus 2,4-DB and bentazon plus 2,4-DB.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidebromoxynil, 3,5-dibromo-4-hydroxybenzonitrilechlorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamideflamprop-methyl, N-benzoyl-N-(3-chloro-4-fluorophenyl)-DL-alaninefluazifop-butyl, (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidMCPA, (4-chloro-2-methylphenoxy)acetic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one2,4-DB, 4-(2,4-dichlorophenoxy)butanoic acidalfalfa, Medicago sativa L. cv. BeaverAsulambentazonbromoxynilchlorsulfuronflamprop-methylfluazifop-butylMCPAsethoxydim2,4-DB
Type
Research
Information
Weed Technology , Volume 4 , Issue 1 , March 1990 , pp. 63 - 67
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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