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Soybean Response to Selected Rice Herbicides¹

Occasionally rice (Oryza sativa L.) herbicide drift or accidental overspray to adjacent growing soybeans [Glycine max (L.) Merr.] occurs in the southeastern U.S. Therefore, five current, or potential, rice herbicides, either alone or in combination with propanil (3',4'-dichloropropionanilide), were applied in the field for 2 years to the soybean cultivar ‘Davis’ when either three (V3) or eight (V8) nodes on the main stem had completely unrolled leaves. The purpose of this study was to determine if injury and yield loss to Davis soybeans occurs from the rice herbicides. Propanil, or combinations containing propanll, generally reduced yield of V3 soybeans, even at 0.6 kg/ha. A rate of 3.4 kg/ha reduced yield of both V3 and V8 soybeans. Bifenox [methyl-5-(2,4-dichlorophenoxy)-2-nitrobenzoatel at 3.4 kg/ha and oxadiazon [2-tert-butyl-4-(2,4-dichloro.5.isopropoxyphenyl)-₂-l,3,4-oxadiazolin-5-one] at 0.8 kg/ha reduced yield of V3 soybeans equivalent to 0.6 kg/ha propanil. Chlorpropham (isopropyl-m-chlorocarbanilate), molinate (S-ethylhexahydro-1H-azepine-1 -carhothioate) and thiobencarb [S-(4-chlorophenyl)diethylcarbamothioate] did not reduce soybean yields at either 0.6 or 3.4 kg/ha when applied at the V3 or V8 stage of growth.

Key Words: Glycine max (L.) Merr. • Propanil • Bifenox • Chlorpropham • Thiobencarb • Oxadiazon • Molinate

² Associate professor, Texas Agric. Exp. Stn., Texas A&M Univ. Agric. Res. and Ext. Center, Beaumont, TX 77706.

Received for publication March 13, 1978.