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Mutual Influences of Seedling Johnsongrass (Sorghum halepense), Sicklepod (Cassia obtusifolia), and Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Barry D. Sims  and
Lawrence R. Oliver
Barry D. Sims
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
Lawrence R. Oliver
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
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Abstract

Field experiments were conducted to evaluate competitive effects of johnsongrass and sicklepod on growth and yield of irrigated and nonirrigated soybeans. Johnsongrass reduced soybean growth early in the growing season. Sicklepod was competitive all season, but competitiveness was greatest during the soybean reproductive stage. Soybean yields were reduced 31% by sicklepod, 14% by johnsongrass, and 36% by both weeds growing together. Nonirrigated soybeans yielded less than irrigated, but percent yield reductions were similar. Johnsongrass dry matter production and seed yield were reduced more than sicklepod by soybean interference. Soybean and sicklepod interference reduced johnsongrass seed production 73 to 95%. Johnsongrass produced 245 to 1238 seeds per plant when interfering with soybeans and sicklepod. Sicklepod seeds per plant were reduced 6 to 31% by johnsongrass interference and 47 to 75% by soybeans and soybeans plus johnsongrass.

Keywords

Johnsongrass, Sorghum halepense (L.) Pers. ♯ SORHAsicklepod, Cassia obtusifolia L. ♯ CASOBsoybean, Glycine max (L.) Merr. ‘Forrest’Interferencecompetitionirrigationleaf area indexcanopy stratamultispecies interferenceweed seed productionSORHACASOB
Type
Weed Biology and Ecology
Information
Weed Science , Volume 38 , Issue 2 , March 1990 , pp. 139 - 147
Copyright
Copyright © 1990 by the Weed Science Society of America 

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