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Early Season Herbicide Applications for Weed Control in Stale Seedbed Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Stacey A. Bruff  and
David R. Shaw
Stacey A. Bruff
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
David R. Shaw
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
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Abstract

Field experiments were conducted in 1989 and 1990 on silty clay and sandy loam soils to evaluate weed control and soybean yield with early-April preplant incorporation of selective herbicides in stale seedbed soybean followed by non-selective weed control measures at planting. Metribuzin applied PPI early followed by chlorimuron POST coupled with either glyphosate or paraquat PRE controlled sicklepod, pitted morningglory, and hemp sesbania to the same extent of that treatment applied PPI at planting. All stale seedbed treatments with POST applications and glyphosate, paraquat, or tillage at planting controlled pitted morningglory over 70%. However, imazaquin or metribuzin applied PPI early without a POST treatment controlled sicklepod and pitted morningglory poorly. Frequently, applying PPI herbicides at planting increased control compared with early PPI applications, but this was overcome by POST treatments. Early stale seedbed applications of metribuzin did not result in more than 60% control of hemp sesbania, whereas metribuzin applied PPI at planting controlled over 85%. However, metribuzin plus chlorimuron controlled hemp sesbania at least 74%, regardless of application timing or tillage method, whereas no imazaquin treatment achieved over 65% control. All stale seedbed herbicide treatments increased soybean yield compared with the untreated stale seedbed check. Selective herbicide treatments with either non-selective herbicide in a stale seedbed program resulted in equivalent yield to PPI at planting treatments most often, except with metribuzin.

Keywords

Chlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acidglyphosate, N-(phosphonomethyl)glycineimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl) 3-(methylthio)-1,2,4-triazin-5(4H)oneparaquat, 1,1′-dimethyl-4,4′-bipyridinium ionhemp sesbania, Sesbania exaltata (Raf.) Rydb. ex A. W. Hill ♯ SEBEXpitted morningglory, Ipomoea lacunosa L. ♯ IPOLAsicklepod, Cassia obtusifolia L. ♯ CASOBsoybean, Glycine max (L.) Merr. ‘Terra-Vig 515’Reduced-tillagetillageCassia obtusifoliaIpomoea lacunosaSesbania exaltatachlorimuronglyphosateimazaquinmetribuzinparaquatCASOBIPOLASEBEX
Type
Research
Information
Weed Technology , Volume 6 , Issue 1 , March 1992 , pp. 36 - 44
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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