<abstract xmlns="http://www.w3.org/1999/xhtml"><p><italic>Amaranthus lividus</italic> is the most frequently reported troublesome weed in the production of <italic>Capsicum annuum</italic> in some regions because it is an aggressive invader, difficult to control, and reduces yield significantly. The effects of <italic>A</italic>. <italic>lividus</italic> on the growth of <italic>C</italic>. <italic>annuum</italic> ‘Baklouti’ were evaluated under greenhouse conditions. Three experiments were conducted to determine the effect of <italic>A</italic>. <italic>lividus</italic> on the biomass accumulation of <italic>C</italic>. <italic>annuum</italic> seedlings for 40 days. In an additive experiment, to one <italic>C</italic>. <italic>annuum</italic> seedling and 1, 2, 3 or 4 <italic>A</italic>. <italic>lividus</italic> seedlings were grown per pot. The second experiment was established to assess <italic>C. annuum</italic> intracompetition using from one to six plants per pot as the density. In a replacement experiment, <italic>C</italic>. <italic>annuum</italic> and <italic>A</italic>. <italic>lividus</italic> seedlings were transplanted into pots with different proportions of both plants (1/5, 2/4, 3/3, 4/2, 5/1). Competition by <italic>A</italic>. <italic>lividus</italic> reduced <italic>C</italic>. <italic>annuum</italic> plant dry weight by as much as 93%. However, <italic>C</italic>. <italic>annuum</italic> had little effect on <italic>A</italic>. <italic>lividus</italic>, reducing dry weight by 31.3% at a 5:1 ratio of <italic>C</italic>. <italic>annuum</italic>: <italic>A</italic>. <italic>lividus</italic>. Relative yield analysis between <italic>C. annuum</italic> and <italic>A. lividus</italic> demonstrated the competitive advantage of <italic>C. annuum</italic> over <italic>A. lividus.</italic> The relative crowding coefficient of both plants changed significantly in the presence of the other plant, at any ratio. The aggressivity of <italic>C</italic>. <italic>annuum</italic> was higher at its lower proportion and <italic>C</italic>. <italic>annuum</italic> was more aggressive towards itself than towards <italic>A</italic>. <italic>lividus</italic> when its density increased.</p></abstract>

Amaranthus lividus is the most frequently reported troublesome weed in the production of Capsicum annuum in some regions because it is an aggressive invader, difficult to control, and reduces yield significantly. The effects of A. lividus on the growth of C. annuum ‘Baklouti’ were evaluated under greenhouse conditions. Three experiments were conducted to determine the effect of A. lividus on the biomass accumulation of C. annuum seedlings for 40 days. In an additive experiment, to one C. annuum seedling and 1, 2, 3 or 4 A. lividus seedlings were grown per pot. The second experiment was established to assess C. annuum intracompetition using from one to six plants per pot as the density. In a replacement experiment, C. annuum and A. lividus seedlings were transplanted into pots with different proportions of both plants (1/5, 2/4, 3/3, 4/2, 5/1). Competition by A. lividus reduced C. annuum plant dry weight by as much as 93%. However, C. annuum had little effect on A. lividus, reducing dry weight by 31.3% at a 5:1 ratio of C. annuum: A. lividus. Relative yield analysis between C. annuum and A. lividus demonstrated the competitive advantage of C. annuum over A. lividus. The relative crowding coefficient of both plants changed significantly in the presence of the other plant, at any ratio. The aggressivity of C. annuum was higher at its lower proportion and C. annuum was more aggressive towards itself than towards A. lividus when its density increased.

Competitive Ability of <italic>C<sc>apsicum annuum</sc></italic> L. Relative to the Weed <italic>A<sc>maranthus lividus</sc></italic> L.

Institution of Agricultural Research and Higher Education, Tunis, Tunisia

Journal of Horticultural Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Competitive Ability of  L. Relative to the Weed  L.

Amaranthus lividus is the most frequently reported troublesome weed in the production of Capsicum annuum in some regions because it is an aggressive invader,...

Competitive Ability of Capsicum annuum L. Relative to the Weed Amaranthus lividus L.

Published Online: Jul 27, 2016

Page range: 79 - 91

Received: Sep 01, 2015

Accepted: Apr 01, 2016

DOI: https://doi.org/10.1515/johr-2016-0010

Keywords
aggressivity, allelopathy, competition, relative crowding coefficient, relative yield, weeds

© 2016 Abdessatar Omezine et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Competitive Ability of Capsicum annuum L. Relative to the Weed Amaranthus lividus L.

Published Online: Jul 27, 2016

Page range: 79 - 91

Received: Sep 01, 2015

Accepted: Apr 01, 2016

DOI: https://doi.org/10.1515/johr-2016-0010

Keywordsaggressivity, allelopathy, competition, relative crowding coefficient, relative yield, weeds

© 2016 Abdessatar Omezine et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
aggressivity, allelopathy, competition, relative crowding coefficient, relative yield, weeds