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Common Sunflower (Helianthus annuus) Interference in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Patrick W. Geier ,
Larry D. Maddux ,
Loren J. Moshier  and
Phillip W. Stahlman
Patrick W. Geier
Affiliation:
Kansas State Univ. Agric. Res. Ctr.-Hays, 1232 240th Ave., Hays, KS 67601
Larry D. Maddux
Affiliation:
Dep. Agron., Kansas State Univ., Manhattan, KS 66502
Loren J. Moshier
Affiliation:
Dep. Agron., Kansas State Univ., Manhattan, KS 66502
Phillip W. Stahlman
Affiliation:
Kansas State Univ. Agric. Res. Ctr.-Hays, 1232 240th Ave., Hays, KS 67601
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Abstract

An in-row competition study was conducted in 1991 and 1992 near Silver Lake, KS to determine the relationship of noncultivated common sunflower density to soybean yield, PAR at the soybean canopy, and common sunflower dry matter production. Because of environmental differences, year main effect interactions occurred, so results are presented by year. For example, 0.3 common sunflower plant/m2produced 4030 kg/ha of aboveground dry matter in 1991 and 1300 kg/ha in 1992. Soybean yield reduction ranged from 19 and 17% with 0.3 common sunflower plant/m2to 97 and 95% with 4.6 plant/m2, in 1991 and 1992, respectively. Assuming a treatment cost of $35/ha and a soybean market price of $0.21/kg, economic threshold levels were 0.1 common sunflower plant/m2in 1991, and 0.07 in 1992. Common sunflower at 0.3 plant/m2reduced PAR at the soybean canopy by 390 and 300 μE/m2/s, or 24 and 18% in 1991 and 1992, respectively. We conclude that the ability of common sunflower to intercept PAR above the soybean canopy is an important component in its interference with soybean.

Keywords

Common sunflower, Helianthus annuus L. # HELANsoybean, Glycine max (L.) Merr. ‘Sherman.’Competitionthreshold levelHELAN
Type
Research
Information
Weed Technology , Volume 10 , Issue 2 , June 1996 , pp. 317 - 321
Copyright
Copyright © 1996 by the Weed Science Society of America 

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