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Agronomy Journal Abstract -

Velvetleaf Control for Solid-Seeded Soybean in Three Corn Residue Management Systems1

 

This article in AJ

  1. Vol. 79 No. 1, p. 119-123
     
    Received: Mar 24, 1986


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doi:10.2134/agronj1987.00021962007900010025x
  1. B. E. Freed,
  2. E. S. Oplinger and
  3. D. D. Buhler2

Abstract

Abstract

Lack of adequate weed control is considered one of the most important factors limiting acceptance of solid-seeded soybean [Glycine max (L.) Merr.] and reduced tillage systems. Recent interest in combining these two production practices further complicates weed control. Field research was conducted at Arlington and Janesville, WI, during 1982 and 1983 to evaluate the effectiveness of preemergence and postemergence herbicide treatments for velvetleaf (Abutilon theophrasti Medic.) control in solid-seeded soybean in three corn (Zea mays L.) residue management systems. Soybean were planted in 0.20-m-wide rows following complete tillage (moldboard plow, cultipack), mulch tillage (chisel plow, field cultivate), and no tillage. Preemergence herbicide treatments included combinations of alachlor [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide] or pendimethalin [N-(l-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] with chloramben (3-amino-2,5-dichlorobenzoic acid) or metribuzin [4-amino-6-(l,l-dimethylethyl)-3-(methylthio)-l,2,4-triazin-5(4H)-one]. Postemergence herbicide treatments included tank-mix and sequential applications of sethoxydim {2-[l-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-l-one} or fluazifop-butyl [butyl(±)-2-(4-{[5-(trifluoromethyl)-2-pyridinyl]oxy}phenoxy) propanoic acid] in combination with acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid} or bentazon [3-(1-methylethyl)-(1H)-2,l,3-benzothiadiazin-4(3H)-one 2,2-dioxide]or both. Preemergence treatments did not completely control velvetleaf and were influenced by residue management. All treatments containing bentazon afforded near complete velvetleaf control without soybean injury, regardless of residue management. Acifluorfen did not completely control velvetleaf and resulted in soybean injury. Soybean yields were not affected by residue management when velvetleaf was controlled. These data indicate that soybean can be successfully produced in a conservation tillage, solid-seeded system.

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