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1 January 2001 Weed Management in Narrow- and Wide-Row Glyphosate-Resistant Soybean (Glycine max)
BRYAN G. YOUNG, JULIE M. YOUNG, LISA C. GONZINI, STEPHEN E. HART, LOYD M. WAX, GEORGE KAPUSTA
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Abstract

Abstract: Field experiments were conducted over 3 yr at three locations in Illinois to evaluate the efficacy of glyphosate in glyphosate-resistant soybean planted in rows spaced 19, 38, and 76 cm. Minimal soybean injury (less than 10%) was observed from any glyphosate treatment. Glyphosate treatments controlled 82 to 99% of giant foxtail. Common waterhemp control was increased as soybean row spacing was decreased. Applying sequential glyphosate applications or increasing the glyphosate rate from 420 g ae/ha to 840 g/ha frequently increased common waterhemp control in 76-cm rows. Velvetleaf control with glyphosate was variable, ranging from 48 to 99%. Decreasing soybean row spacing, utilizing sequential glyphosate applications, or increasing the glyphosate rate improved velvetleaf control in at least four of eight site-years. Glyphosate treatments generally resulted in weed control and soybean yield equal to or greater than the standard herbicide treatments. However, glyphosate treatments yielded less than the hand-weeded control in four of eight site-years, suggesting that weed control from glyphosate treatments was sometimes inadequate.

Nomenclature: Glyphosate; common waterhemp, Amaranthus rudis Sauer #3 AMATA; giant foxtail, Setaria faberi Herrm. # SETFA; velvetleaf, Abutilon theophrasti Medik. # ABUTH; soybean, Glycine max (L.) Merr.

Additional index words: Herbicide-resistant crops.

Abbreviations: EPOST, early postemergence; LPOST, late postemergence; MPOST, mid-postemergence; NIS, nonionic surfactant; UAN, 28% urea ammonium nitrate; WAT, weeks after treatment.

BRYAN G. YOUNG, JULIE M. YOUNG, LISA C. GONZINI, STEPHEN E. HART, LOYD M. WAX, and GEORGE KAPUSTA "Weed Management in Narrow- and Wide-Row Glyphosate-Resistant Soybean (Glycine max)," Weed Technology 15(1), 112-121, (1 January 2001). https://doi.org/10.1614/0890-037X(2001)015[0112:WMINAW]2.0.CO;2
Published: 1 January 2001
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