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Response of soybean cultivars to bentazon, bromoxynil, chloroxuron, and 2,4-DB



Response of soybean cultivars to bentazon, bromoxynil, chloroxuron, and 2,4-DB



Weed Science 22(1): 35-41



The response of several hundred soybean cvs. to post-em. application of four herbicides was evaluated in the field, greenhouse and growth chamber in 1970-72. Post-em. application of 3.4 kg bentazone/ha did not significantly reduce yields of the seven commercially important soybean cvs. evaluated. All entries in the regional breeding trials, Uniform Test I-IV, were relatively tolerant of post-em. applications of the herbicides at rates about double those required for weed control. The observed order of phytotoxicity was 3.4 kg bentazone/ha < 3.4 kg chloroxuron/ha < 0.3 kg bromoxynil/ha = 0.4 kg 2,4-DB/ha. Of the 338 named US and Canadian cvs. in the US Department of Agriculture soybean germplasm collection, all but one (Hurrelbrink) were tolerant to post-em. bentazone at 3.4 kg/ha. Ten plant introductions from Japan and Hurrelbrink were highly sensitive to bentazone, bromoxynil and 2,4-DB and somewhat sensitive to chloroxuron. From summary.

Accession: 000183485

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DOI: 10.2307/4042295

Download PDF Full Text: Response of soybean cultivars to bentazon, bromoxynil, chloroxuron, and 2,4-DB



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