1- Abdolrahmani B. 2003. Effects of plant density on yield and agronomic traits of sunflower cv. Armavirsky under dryland condition in Maragheh, Iranian Journal of Crop Science, 5: 216-224.
2- Amini A., Sharifzadeh F., Baghestani M.A., Mazaheri D., and Atri A. 2006. Competitive effect of rye (Secale cereal L.) on the growth of winter wheat. Special Iranian Journal of Agricultural Sciences Resources, Tehran University. Agri. Agrono. Plant Breeding Biotechnology, 37(2): 273-285.
3- Bauman D.T., Bastians L., and Kropff M.J. 2002. Inter cropping system optimization for yield, quality and weed suppression combining mechanistic and descriptive models, Agronomy Journal, 94: 734-742.
4- Black Shaw R.E., Molnar L.J., Muendel H.H., Saind G., and Li X.J. 2002. Integration of cropping practices and herbicides improves weed management in dry bean, Weed Technology, 14: 327- 336.
5- Eilkaee M.N., and Emam Y. 2003. Effect of plant density on yield and yield components in two winter oilseed rape (Brassica napus L.) cultivars, Iranian Journal of Agricultural Science, 34: 509-515.
6- Fernandez O.N., Vignolio O.R., and Requesens E.C. 2002. Competition between corn (Zea mays) and Bermuda grass (Cynodon dactylon) in relation to the crop plant arrangement, Agronomy Journal, 22: 293- 305.
7- Fleming G.F., Young F.L., and Ogg A.G. 1988. Competitive relationships among winter wheat (Triticum aestivum), jointed goatgrass (Aegilops cylindrica) and downy brome (Bromus tectorum), Weed Science, 36: 479-489.
8- Gaudet C.L., and Keddy P.A. 1988. A comparative approach to predicting competitive ability from plant traits, Nature, 334: 242-243.
9- Ghadiri H. 2005. Effect of field bindweed (Convolvulus arvensis) and pinto bean (Phaseolus vulgaris) densities on growth and yield of pinto beans in greenhouse. Proc. 13th European Weed Research Society Symposium. Bari. Italy.
10- Harker K.N., Clayton G.W., Odonovan J.T., and Blackshaw R.E. 2001. Canola variety and seeding rate effects on weed management and yield, Weed Science and Society of America, 41: 25-32.
11- Holman J.D., Bussan A.J., Maxwell B.D., Miller P.R., and Mickelson J.A. 2004. Spring wheat, canola, and sunflower response to Persian darnel (Lolium persicum) interference, Weed Technology, 18: 509-520
12- Iftekhar H.B., Riaz A., Abdul J., Nazir M.S., and Mahmood T. 2006. Competitive behavior of component crops in different Sesame-Legume intercropping systems, Journal of Agricultural Biology, 2: 165-167.
13- Jafari Zadeh S.H., and Modhj A. 2011. Evaluation of weed competition Pnyrk (Malva spp) at different levels of nitrogen on yield, Iranian Crop Science, 42(4): 777-767.
14- Jannink J.L., Orf J.H., Jordan N.R., and Shaw R.G. 2000. Index selection for weed suppressive ability in soybean, Crop Science, 40: 1087–1094.
15- Javanshir A., Dabbagh Mohammadi Nasab A., Hamidi A., and Golipor M. 2000. Inter cropping ecology, Ferdosi university press. (In Persian).
16- Khachatourians G., Summer A.K. and Philips P. 2001. An introduction to the history of canola and the scientific basis for innovation. CABI. London.
17- Lemerle D., Verbeek B., and Orchard B. 2001. Ranking the ability of wheat varieties to compete with Lolium rigidum, Weed Research, 41: 197–209.
18- Mac Mullan P.M., Daun J.K., and DeCercq D.R. 1994. Effect of weed mustard (Brassica kaber) competition on yield and quality of triazintolerance and triazin-susceptible canola (Brassica napus and Brassica rapa), Canadian Journal of Plant Science, 74: 369-374.
19- McMullan P.M., Daun J.K., and Declercq D.R. 1994. Effect of wild mustard (Brassica kaber) competition on yield and quality of triazinetolerant and triazinesusceptible canola (Brassica napus and Brassica rapa), Canadian Journal of Plant Science, 74: 369-374.
20- Mirshekari B., and Javanshir A.S. 2008. Reaction of morphological traits, yield and harvest index of rape seed cultivars time weeds weed control, New findings of Agriculture, 4: 411-400.
21- Najafi H., Loui-Hassanzadeh M., Rashed Mohasel M.H., Zand A., and Baghestani M.A. 2006. Ecological management of grass weeds, Plant Pests Diseases Research. Ins. 599 p.
22- Ozer H. 2003. The effect of plant population densities on growth, yield and yield components of two spring rapeseed cultivars, Plant Soil Environment, 49: 422-426.
23- Ozoni Davaji A. 2006. Effects of plant density and planting pattern on yield, yield components and growth indices of apetalous flowers and petalled rapeseed (Brassica napus L.). M.Sc. Thesis. Faculty of Agriculture College, Guilan University. Iran.
24- Radosevich S.R., Holt J., and Ghersa C. 1997. Weed Ecology: Implications for management. John Wiley. 589 p.
25- Rahimian H., and Shariati S.H. 1998. Grass weeds and crop modeling competition, publishing, education agriculture. 294 p.
26- Rahman I., Ahmad H., Serajuddin I., Ahmad I., Abbasi F., Islam M., and Ghafoor S. 2009. Evaluation of rapeseed genotypes for yield and oil quality under rainfed conditions of district Mansehra, African Journal of Biotechnology, 8: 6844-6849.
27- Rose S.P., and Bell J.M. 1982. Reproduction of mice fed low erucic acid rapeseed oil contaminated with weed seed oils, Canadian Journal of Animal Science, 62: 617-624.
28- Ross D.M., and Van Acker R.C. 2005. Effect of nitrogen fertilizer and landscape position on wild oat (Avena fatua) interference in spring wheat, Weed Science, 53: 869-876.
29- Safahani Langerodi A., Kamkar B., Zand E., Bagherani N., and Bagheri M. 2008. Reaction of grain yield and its components of canola (Brassica napus L.) cultivars in competition with wild mustard (Sinapis arvensis L.) in Gorgan, Iranian Journal of Crop Science, 9: 356-370.
30- Safahany Langroodi A.R., Kamkar B., Zand A., Baqrany N., and Bagheri M. 2007. The reaction yield in competition with weeds in oilseed rape and wild mustard (Sinapis arvensis L.) in Iran, Iranian Crop Science, 6(4): 370-356.
31- Salehi B. 2004. Effect of row spacing and plant density on grain yield and yield components in maize (cv. Sc 704) in Miyaneh, Iranian Journal of Crop Science, 6: 383-394.
32- Soleimani F., Ahmadvand G., and Sadatyan B. 2010. Indices of growth and yield of rapeseed (Brassica napus L.) in competition with wild mustard (Sinapis arvensis L.) affected by different nitrogen levels, Journal of Agriculture and Ecology, 2(4): 547-537.
33- Tingle C.H., Steele G.L., and Chandler J.M. 2003. Competition and control of smell melon (Cucumis melo var. dudaim Naud.) in cotton, Weed Science, 51: 589-591.
34- Van Acker R.C. and Dree R. 1999. Wild oat (Avena Fatua L.) and wild mustard (Brassica kaber) wheller interference in canola (Brassica napus), Weed Science and Society of America. 119 p.
35- Wall D.A. 1997. Dog mustard (Erucastrum gallicum) response to crop competition. Weed Science. 45: 397-403.
36- Warwick S.I., Bechie H.J., Thomas A.G., and Mcdonald T. 2000. The biology of Canadian weeds. 8. Sinapis arvensis L, Canadian Journal of Plant Science, 71: 473-480.
37- Wright A.J. 1981. The analysis of yield-density relationship in binary mixture using inverse polynomials, Journal of Agricultural Science, 96: 564-567.