Competition effects of lambs quarters (Chenopodium album) on physiological characteristics and rapeseed yield (Brassica napus cv. Hyolla 401)

Subject Areas : New Finding in Agriculture

B. Mirshekari ¹

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

Received: 2015-11-27 Accepted : 2015-11-27 Published : 2013-02-19

Keywords: Green Cover, leaf chlorophyle content, economical damage, Hyolla,

Abstract :

         In order to determination of effects of lambsquarters (Chenopodium album L.) on physiological characteristics and yield of rapeseed (Brassica napus L.), cv. Hyolla, a factorial experiment was carried out. Factors were weed densities (4, 8 and 12 plants per meterof row) and relative time of weed emergence (emerged with rapeseed, 15 and 30 days after crop emergence). Crop leaf area index decreased from 3.1 in control to 1.4 in full season interference of 12 weeds per meterof row (121% reduction). Regarding to leaf chlorophyle content, difference between treatments of full season interference of 12 weeds and control was significant. Rapeseed green cover was the highest, when weed emerged 30 days after crop. Crop yield reduced 47%, compared with control, when 12 weeds competed with crop until late growth season. Rapeseed green cover, thousands seed weight and fruit number per plant could totally explain 895 of crop yield changes. Threshold of economical damage of lambsquarter in rapeseed field was in 4 weeds per meter of crop row in 30 days after emergence.

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