Marigold (Calendula officinalis) yield as affected by lamb's-quarters (Chenopodium album) competition

Document Type : Research Paper


Department of Agronomy and Plant Breeding, Tabriz Branch, Islamic Azad University, Tabriz, Iran.


To study interferential effect of lamb's-quarters (Chenopodium album L.) on
marigold (Calendula officinalis) yield and lamb's-quarters seed production two
factorial field experiments were conducted in Tabriz, Iran, during 2010-2011.
Treatments were densities of lamb's-quarters (0, 2, 4, 6 and 8 plants per meter row)
and relative times of its emergence (0, 10, 20, 30 and 40 days after marigold
emergence). Marigold could tolerate4 lamb's-quarters plants per meter row without
any significant yield reduction, when it emerges 40 days after that of marigold. A
suitable fit to model of Cousens et al. was obtained for all marigold flower yield
data sets at interference with lamb's-quarters. Results also indicate that controlling
lamb's-quarters early in the season may reduce its seed production capacity.