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Effect of Date of Treatment of Johnsongrass (Sorghum halepense) on Soybean (Glycine max) Yields

Published online by Cambridge University Press:  12 June 2017

Chester G. McWhorter
Chester G. McWhorter*
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
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Abstract

In a 6-yr field study, johnsongrass growing in ‘Forrest’ soybeans for the entire growing season reduced yields 45% in the year with most rainfall and 69% in the year with least rainfall. Yields of soybeans grown without johnsongrass competition were 56% higher in the year with the most rainfall than in the year with least rainfall. Yields of soybeans with full-season competition were reduced 75% from those in the year with most rainfall as compared with those in the year with least rainfall. The number of weeks of johnsongrass competition required to significantly reduce soybean yields varied from 3 wk, in the year with least rainfall, to 8 wk, in the year with most rainfall. Nine applications of sethoxydim at 0.84 kg ai ha-1 or haloxyfop at 0.55 kg ai ha-1 each year did not reduce soybean growth or yields.

Keywords

Haloxyfop, 2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onesoybean, Glycine max (L.) Merr.johnsongrass, Sorghum halepense (L.) Pers. ♯ SORHACompetitioninterferencewater relationsdrought stresssethoxydimhaloxyfopSORHA
Type
Research
Information
Weed Technology , Volume 5 , Issue 2 , June 1991 , pp. 381 - 386
Copyright
Copyright © 1991 Weed Science Society of America 

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