Effects of cultural factors on Weeds and Yield of Canola (Brassica napus L.) in West Azarbaijan

In order to study the effects of row spacing and sowing density on the weed density and yield of Rapeseed, cultivar " SLM0046", an experiment was conducted at Miandoab Agriculture Research Station in the Northwest of Iran during growing season of 2003/2004.The experiment was arranged as factorial spilt plot in CRB design with four replications which multiple of factor A (row spacing) in three level (20,25 and 35 cm) and factor B (sowing density) in three level (4,6 and 8 kg /ha) as main factor and factor C (weed control) in three level (no wedding , two hand weeding and three hand weeding) considered as sub factor .Analysis of variance results indicated that effect of row distance was significant at P= 5 % .Means comparison by Duncans multiple range test showed that row distance of 20 and 25 cm were placed in one group with the yield of 2422 and 2332 Kg/ha respectively and row distance of 35 cm with 1789 Kg/ha was placed in another group .The result also showed that the effect of row distance on the density of weeds of Crucifers and grasses were significant at P=5% and like the result of yield were placed in different groups. Main weeds at the site of trial were: Volunteer Wheat, Bindweed (Convolvulus arvensis), Flix weed (Descurainia Sophia), Henbit (Lamium sp) and Pick Purse (Capsella bursa –pastoris).