Effect of competition of wild mustard (Sinapis arvensis L.) on yield and yield components of canola (Brassica napus L. (in pot and field conditions

To evaluate the effect interference of mustard on yield and yield components of canola, and observation competition difference of mustard in pot and field condition, experiments were conducted in 2006 and 2007 in the greenhouse and farm of College of Agriculture, Ramin Agricultural and Natural Resources University of Khouzestan, respectively. Pot experiment the factorial set of treatments was arranged within a completely randomized, and field experiment a split-plot design was arranged in a randomized complete block design with three replications. Treatments were various mustard densities in five levels (0, 1, 2, 3 and 5 plants pot equal with 0, 7, 14, 21 and 35 plants m-2 in field) and canola densities in three levels (10, 13 and 16 plants pot equal with 60, 80 and 100 plants m-2 in field). Result in pot condition indicated that increase in mustard density was caused to decrease all traits seed yield, pod number per plant, seed number per pod, and 1000-seed weight. While in field condition, except seed number per pod, and 1000-seed weight was significant on other traits, but increase density of canola at both conditions was caused to increase only seed yield. Interaction between different densities of mustard and canola in pot condition on seed number per pod, and in field condition seed yield and seed number per pod had significantly. In addition, curve of yield loss showed that the effect of interference different densities of mustard on seed yield of canola was differed in greenhouse and field condition. The seed yield most loss of canola was got in greenhouse from densities 10, 13 and 16 plants per pot and in field from densities 80, 60 and 100 plants m-2, respectively. This order was representative of difference competition in pot and field conditions.