In order to control canola seed growth and production inhibiting factors, an experiment, including 18 treatments and three replications, was conducted within split plot design during 2011 and 2012 farming years in the farmlands of Safi Abad Agricultural Research Center in Dezful. The main planting treatment included three levels: two-row 61-centimeter furrows as well as two-row and three-row 75-centimeter furrows. The herbicide treatment included six levels, namely trifluralin, trifluralin+clopyralid, trifluralin+clopyralid+haloxyfop-r-methyl, clopyralid+haloxyfop-r-methyl and evidence group with and without herbicide. The results indicated that spraying with trifluralin+clopyralid+haloxyop could control 81% of the weeds until about a month after the exertion of experimental treatments. The lowest density and dried weight of weeds was evidenced for complete weed control treatment, trifluralin+clopyralid+haloxyfop treatment and trifluralin+clopyralid treatment in all of the sampling stages. The highest seed performance belonged to complete weed control treatment followed by to the two-row 75-centimeter furrow planting method along with the use of trifluralin+clopyralid+haloxyfop, with a value of 3.1tons/ha
