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Effects of Density and Species Proportion on Competition between Spurred Anoda (Anoda cristata) and Velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

David T. Patterson
David T. Patterson*
Affiliation:
Plant Physiol., U.S. Dep. Agric., Dep. Bot., Duke Univ., Durham, NC 7706
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Abstract

Spurred anoda and velvetleaf were grown for 40 days in controlled-environment chambers in monocultures at densities of 2, 4, 8, and 12 plants per 20-cm-diam pot and in mixed culture with all combinations of 2, 4, 8, and 12 plants of each species per pot. The day/night temperature was 29/23 C, and the photosynthetic photon flux density (PPFD) was 1000 μE m–2 s–1. Shoot dry weights and leaf areas of the two species were similar when they were grown in monoculture. However, in mixed culture spurred anoda exceeded velvetleaf in leaf area/plant and shoot weight/plant in 15 out of 16 treatments. Multiple linear regression equations relating shoot biomass/plant to the density of both species in mixed culture were calculated. Comparison of competition coefficients from these equations indicated that the competitive impact of a single spurred anoda plant was equivalent to the impact of 2.5 velvetleaf plants. In mixed culture, spurred anoda always contributed a greater proportion of the total shoot weight and total leaf area per pot than would be predicted from its proportion of the total plant population. These results indicate spurred anoda is competitively superior to velvetleaf.

Keywords

Spurred anoda, Anoda cristata (L.) Schlecht. # ANVCRvelvetleaf, Abutilon theophrasti Medik. # ABUTHCompetition-methodology
Type
Weed Biology and Ecology
Information
Weed Science , Volume 38 , Issue 4-5 , September 1990 , pp. 351 - 357
Copyright
Copyright © 1990 by the Weed Science Society of America 

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