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Abstract

To investigate the effect of planting pattern and herbicides on the grain yield and rapeseed oil, an experiment with 18 treatments in three replications was carried out within the format of split-plot design during two farming years of 2011 and 2012, in agricultural fields belonging to Safi Abad agricultural research center. The main treatment included three levels: 61-centimeter furrows with two planting rows, 75-centimeter furrows with respectively three and two planting rows and the herbicide treatment including  six levels of trifluralin (trifluralin +clopyralid), (trifluralin + clopyralid +haloxyfop-r-methyl), (clopyralid + haloxyfop-r-methyl). The control group included with and without weeds. The results indicated that the 75-centimeter furrows with three rows along with herbicides (trifluralin+clopyralid+haloxyfop) followed by 75-centimeter furrows with two planting rows besides herbicides (trifluralin+clopyralid+haloxyfop) were the most appropriate treatments hence they were recommended due to grain yield enhancements, grain weight, oil yield and biological yield of rapeseed.