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MSMA and Pyrithiobac Effects on Cotton (Gossypium hirsutum) Development, Yield and Quality

Published online by Cambridge University Press:  12 June 2017

Mark W. Shankle ,
Robert M. Hayes ,
Vernon H. Reich  and
Thomas C. Mueller
Mark W. Shankle
Affiliation:
Dep. of Plant and Soil Sci., Univ. of Tennessee, Knoxville, TN 37901
Robert M. Hayes
Affiliation:
Dep. of Plant and Soil Sci., Univ. of Tennessee, Knoxville, TN 37901
Vernon H. Reich
Affiliation:
Dep. of Plant and Soil Sci., Univ. of Tennessee, Knoxville, TN 37901
Thomas C. Mueller*
Affiliation:
Dep. of Plant and Soil Sci., Univ. of Tennessee, Knoxville, TN 37901
*
Address Correspondence to: Tom Mueller, P.O. Box 1071, Knoxville, TN 37901.
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Abstract

Field research was conducted in Tennessee at Jackson in 1991 and at Milan in 1992 to compare the effect of MSMA and pyrithiobac on cotton development, yield, and quality. In separate treatments to different plots, pyrithiobac at 0.14 kg ai ha–1 did not affect development, yield, and quality of cotton. MSMA at 2.24 kg ai ha–1 decreased cotton plant internode length 10 to 15% and height by 15% 5 wk after late treatment both years. MSMA applied to 50 cm cotton reduced subsequent plant height in 1992, but other plant characteristics were not affected. In 1991, MSMA increased squares and decreased blooms and bolls for monopodia and sympodia position one and two, which suggested a delay in plant development. In 1991, mechanical harvest lint yields were decreased by MSMA at first harvest while increasing second harvest lint yields. However, in 1991 only MSMA applied late decreased total harvest lint yield 20%. Plant mapping data determined that the yield decrease was a result of decreased yields at sympodia positions one and two. Cotton seed arsenic analysis indicated that MSMA-late increased arsenic levels by ≈ 1 ppmw in 1991 for sympodia at position one and two compared to the untreated check, while position two contained the highest level of 1.8 ppmw.

Keywords

MSMA, monosodium salt of methylarsenic acidpyrithiobac, [sodium salt of 2-chloro-6-[(4,5-dimethoxy-2-pyrimidinyl)thio]benzoic acid]cotton, Gossypium hirsutum L. ‘Deltapine 50.’DPX-PE350monopodiasympodiaplant mappingmaturity
Type
Weed Management
Information
Weed Science , Volume 44 , Issue 1 , March 1996 , pp. 137 - 142
Copyright
Copyright © 1996 by the Weed Science Society of America 

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