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Sicklepod (Senna obtusifolia) Response to Shading, Soybean (Glycine max) Row Spacing, and Population in Three Management Systems

Published online by Cambridge University Press:  20 January 2017

Glenn R. W. Nice ,
Normie W. Buehring  and
David R. Shaw
Glenn R. W. Nice
Affiliation:
Department of Plant and Soil Sciences, Box 9555, Mississippi State University, Mississippi State, MS 39762
Normie W. Buehring*
Affiliation:
North Mississippi Research and Extension Center, Verona, MS 38879
David R. Shaw
Affiliation:
Department of Plant and Soil Sciences, Box 9555, Mississippi State University, Mississippi State, MS 39762
*
Corresponding author's E-mail: buehring@ra.msstate.edu.
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Abstract

Studies were conducted in 1997 and 1998 at the Northeast Mississippi Research and Extension Center to investigate the effects of row spacing (76, 38, and 19 cm), soybean population, and three weed management systems on sicklepod growth and seed production. The cultivars ‘Hartz 5088RR’ (glyphosate-tolerant) and ‘Hutcheson’ (a conventional cultivar) were used in two separate studies. The average soybean populations over cultivars and year were 245,000 (low), 481,000 (medium), and 676,000 (high) plants/ha. The three weed management systems were: no (untreated), one, and two herbicide applications. In the glyphosate-tolerant system, one or two postemergence (POST) applications of glyphosate were used, whereas in the conventional system, flumetsulam plus metolachlor preemergence was used alone (single) or followed by chlorimuron POST (sequential). Reducing soybean row spacing from 76 cm, coupled with increased soybean population, reduced sicklepod population up to 80%. Except for Hutcheson in 1998, reducing row spacing and increasing soybean population also reduced sicklepod seed production in both the untreated and the single applications. A single herbicide application reduced sicklepod population up to 68% from untreated plots. However, except for Hartz 5088RR in 1998, the sequential application did not further reduce sicklepod population. In a shading study, partial shading increased sicklepod height but reduced dry weight. However, as shading level increased from 65 to 80 and 95%, height was also reduced.

Keywords

Chlorimuronflumetsulamglyphosatemetolachlorsicklepod, Senna obtusifolia (L.) Irwin and Barnaby #3 CASOBsoybean, Glycine max (L.) MerrGlyphosate-tolerant soybeansequential herbicide applicationsseed productionMG, maturity groupPOST, postemergencePRE, preemergenceWAP, weeks after planting
Type
Research
Information
Weed Technology , Volume 15 , Issue 1 , March 2001 , pp. 155 - 162
Copyright
Copyright © Weed Science Society of America 

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