Journal of Food, Agriculture and Environment
Vol 9,
Issue 3&4,2011
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Time duration between sunflower and weed emergence influences physiological characteristics of Chenopodium album
Author(s):
Hossein Golipour,
Bahram Mirshekari *Recieved Date: 2011-06-28, Accepted Date: 2011-10-05
Abstract:In order to study effects of time duration between sunflower and weed emergence on physiological characteristics of Chenopodium album a field experiment was carried out at the Islamic Azad University, Tabriz Branch, Iran. Treatments were sunflower hybrids (Goldis, Allstar) and weed times of emergence (0, 4 and 8 weeks after crop). The effect of studied treatments on green cover percentage, LAI and leaf area per plant of lambsquarters was significant. Goldis and Allstar could increase lambsquarters green cover up to 39% and 48%, respectively, when emerged simultaneously with crop, and 19% and 29%, respectively, when emerged 4 weeks after crop. The greatest weed LAI was consistently produced by Goldis and the lowest one by Allstar. The longer growth period of Goldis, coupled with its taller stature, must have contributed to its greater competitive ability compared to Allstar. In three interference times of weed, Goldis restricted weed leaf area better than Allstar. When lambsquarters emerged simultaneously with crop, leaf area per weed plant decreased from 1313 cm2 to 1113 cm2 and 1063 cm2 in Goldis, and from 1288 cm2 to 1250 cm2 and 1238 cm2 in Allstar hybrids, as compared to those lambsquarters emerged 4 and 8 weeks after sunflower, respectively. Plant breeders must improve tall height stature hybrids in sunflower for increasing of the competitive ability against troublesome weeds such as lambsquarters.
Keywords:Physiological characteristics,
green cover, sunflower, troublesome weedsJournal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 3&4
Category: Environment
Pages: 633-634
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