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Soybean (Glycine Max) Cultivar Tolerance to San 582H and Metolachlor As Influenced by Soil Moisture

Published online by Cambridge University Press:  12 June 2017

Bradley T. Osborne ,
David R. Shaw  and
Randall L. Ratliff
Bradley T. Osborne
Affiliation:
Dep. Plant & Soil Sci., Miss. State Univ., Mississippi State, MS 39762
David R. Shaw
Affiliation:
Dep. Plant & Soil Sci., Miss. State Univ., Mississippi State, MS 39762
Randall L. Ratliff
Affiliation:
Sandoz Agro, Inc., Greenville, MS 38701
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Abstract

Field experiments were conducted in 1991 and 1992 to evaluate differential soybean cultivar tolerance to SAN 582H and metolachlor applied PRE, as influenced by soil moisture. Eighteen d after planting, a 3× rate of SAN 582H (3.0 kg ai ha−1) reduced plant populations of ‘Wright,’ ‘Bedford,’ and ‘Stonewall’ and metolachlor did not. At leaf drop, neither herbicide reduced crop height with optimum moisture. With excessive moisture, 3× rates of SAN 582H reduced plant height of Wright, Bedford, ‘Walters,’ ‘Young,’ ‘Brim,’ and ‘Bryan,’ and metolachlor reduced height of ‘Sharkey.’ The greatest yield reductions were due to excessive moisture, regardless of herbicide. Neither herbicide reduced yields with optimum moisture nor did a 1× rate with excessive moisture. However, with excessive moisture, a 3× rate of metolachlor (5.0 kg ai ha−1) reduced yield of Bedford by 470 kg ha−1, and the 3× rate of SAN 582H reduced yield of ‘Rhodes,’ Walters, and ‘Centennial’ more than 500 kg ha−1. Overall, soybean tolerance to both herbicides was good, but if used above recommended rates and with excessive moisture, injury can occur.

Keywords

SAN 582H, (1RS, aRS)-2-chloro-N-(2,4-dimethyl-3-thienyl)-N-(2-methoxy-1-methylethyl)-acetamidemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidesoybean, Glycine max (L.) Merr.Tolerancecultivar
Type
Weed Management
Information
Weed Science , Volume 43 , Issue 2 , June 1995 , pp. 288 - 292
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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