Affholder, F., Poeydebat, C., Corbeels, M., Scopel, E., and Tittonell, P. 2013. The yield gap of major food crops in family agriculture in the tropics: Assessment and analysis through field surveys and modeling. Filed Crops Research 143: 106-118.
Aldrich, R.J. 1984. Weed-Crop Ecology: Principles of Weed Management, Breton Publishers, North Scituate, Mass. 448 pp.
Anderson, R.L. 2000. A cultural systems approach eliminates the need for herbicides in semiarid pros millet. Weed Technology 14: 602–607.
Armin, M., Noormohammadi, G., Zand, E., Baghestani, M.A., and Darvish, F. 2007. Competition effect of wild oat (Avena ludoviciana L.) on two wheat (Triticum aestivum L.) genotypes contrasting in their competitive ability. Iranian Journal of Field Crops Research 8: 19-18. (In Persian with English Summary)
Carlson, H.L., and Hill, J.E. 1985. Wild oat (Avena fatua) competition with spring wheat: Plant density effect. Weed Science 33: 176-181.
Coleman, R., and Luckett, D.J. 2001. Genetic improvement and agronomy for enhanced wheat competitiveness with weeds. Australian Journal of Agricultural Research 52: 527-548.
Davis, A.S., Renner, K.A., and Gross, K.L. 2005. Weed seed bank and community shifts in a long-term cropping systems experiment. Weed Science 53: 296–306.
Emam, Y. 2003. Grain Agriculture. Shiraz University Publication Center Press, Shiraz, Iran 131 pp. (In Persian)
WWW.FAO.Org. Available at: http://faostat.fao.org/site/567/default.aspx#ancor
Finckh, M.R., and Karpenstein-Machan, M. 2002. Intercropping for pest management.
Encyclopedia of Pest Management. WWW. Informaworld.com.
Govindra, S., Sight, D., and Sight, N.K. 1986. Effect of date of sowing of wheat on Phalaris minor and wheat yield. Weed Abstract 35: 187.
Hasan-zade-loii, M. 2002. Wheat audiotape designed to compete with weeds. PhD Thesis in Agronomy, Islamic Azad University, Tehran Oloom Tahghighat Branch. (In Persian with English Summary)
Karimmojeni, H., Rahimiyan Mashhadi, H., Mohamad Alizade, H., Nassiri Mahallati, M., and Zand, A. 2008. The estimated corn yield loss due to present in single and pairs of rough cocklebur and Jimson weed, weeds spices using empirical models based on the density. Journal of Crop Science 39: 127-136. (In Persian with English Summary)
Koocheki, A., Nassiri Mahallati, M., and Zare-Faiz-Abadi, A. 2004. Agriculture biodiversity in Iran. Desert 9: 49-68. (In Persian with English Summary)
Legere, A., and Samson, D.N. 1999. Relative influence of crop rotation, tillage, and weed management on weed associations in spring barley cropping systems. Weed Science 47: 112-122.
Lemerle, D., Gill, G.S., Murphy, C.E., Walker, S.R., Cousens, R.D., Mokhtari, S., Peltzer, S.J., Coleman, R., and Lickett, J.D. 2001. Genetic improvement and agronomy for enhanced wheat competitiveness with weeds. Australian Journal of Agricultural Research 52: 527–548.
Mclaughlin A., and Minrau, P. 1995. The impact of agricultural practices on biodiversity. Agriculture, Ecosystems and Environment 55: 201-212.
Menalled, F.D., Gross, K.L., and Hammond, M. 2001. Weed community shifts associated with continues glyphosate applications in corn and soybean rotation. Weed Science 53: 22-25.
Milberg, P., and Hallgren, E. 2004. Yield loss due to weeds in cereals and its large-scale variability in Sweden. Field Crops Research 89: 199–209.
Mohler, C.L. 2001. Enhancing the competitive ability of crops. In: Liebman M., Mohler, C.L., and Staver, C.P. (Eds.). Ecological Management of Agricultural Weeds. Cambridge University Press, Cambridge. p. 269–322.
Montazeri, M. 2007. Influence of winter wild oat (Avena ludoviciana), annual canary grass (Phalaris minor) and wild mustard (Sinapis arvensis) at different density on yield and yield component of wheat. Pajouhesh and Sazandegi 24: 72-78. (In Persian with English Summary)
Montazeri, M., Zand, A., and Baghestani, M.A. 2005. Weeds and Control Them in Iran Wheat Fields. Agriculture Education Press. 85 pp. (In Persian)
Naeem, S., Chapin, C.F.S., Costanza, R., Ehrlich, P.R., Golley, F.B., Hooper, D.U., Lawton, J.H., O,Neill, R.V., Mooney, H.A., Sala, O.E., Symstad, A.J., and Tilman, D. 2006. Biodiversity and Ecosystem Functioning: Maintaining Natural Life Support Processes. U.S. Environmental Protection Agency. http://esa.sdsc.edu/.
Nekahi, M.Z., Soltani, A., Siahmarguee, A., and bagherani, N. 2014. Yield gap associated with crop management in wheat: Case study, Golstan province –Bandargaz. Electronic Journal of Crop Science. Accepted. (In Persian with English Summary)
Oerke, E.C., Dehne, H.W., Schönbeck, F., and Weber, A. 1994. Crop Production and Crop Protection: Estimated Losses in Major Food and Cash Crops, Elsevier, Amsterdam.
Pimentel, D., McNair, S., Janecka, J., Wightman, J., Simmonds, C., Connell, C.O., Wong, E., Russel, L., Zern, J., Aquino, T., and Tsomondo, T. 2001. Economic and environmental threats of alien plant, animal, and microbe invasions. Agriculture, Ecosystems and Environment 84: 1–20.
Rezaei, A., and Soltani, A. 2008. Introduction to Applied Regression. Isfahan Jahad Daneshgahi Press, Isfahan, Iran. 294 pp. (In Persian)
Salehiyan, H., Rahimiyan, H., Majidi, A., and Ghanbari, A. 2003. A Survey of natural weed population interference in wheat crop in Mazandran provience. Iranian Journal of Crop Sciences 5: 1-14. (In Persian with English Summary)
Sarabi, V., Nezami, A., Nassiri Mahallati, M., and Rashed Mohassel, M.H. 2010. Reply growth characteristics of maize (Zea mays L.) to compete lambsquarters (Chenopodium album L.). Journal of Agroecology 2: 398-407. (In Persian with English Summary)
Satio, K. 2010. Weed pressure level and the correlation between weed competitiveness and rice yield without weed competition: An analysis of empirical data. Field Crops Research 117: 1-8.
Shrestha, A., Knezevic, S.Z., Roy, R.C., Ball-Coelho, B.R., and Swanton, C.J. 2002. Effect of tillage, cover crop and crop rotation on the composition of weed flora in sandy soil. Weed Research 42: 76-87.
Soltani, A. 2007. Application of SAS in statistical analysis. Jahad Daneshgahi Mashhad Press, Iran. 182 pp. (In Persian)
Spitters, C.J.T., and Berg, V.D. 1982. Competition between crop and weed: A system Approach in Biology and Ecology of Weeds. In: Holzner, W., and Numata, N. (Eds.) Biology and Ecology of Weed. Junk Publishers.
Tengberg, A., Ellis-Jones, J., Kiome, R., and Stocking, M. 1998. Applying the concept of agro diversity to indigenous soil and water conservation practices in eastern Kenia. Agriculture, Ecosystems and Environment 70: 259-272.
Vazan, S., and Beheshti, H. 2010. Study of competitive ability of four weed species and two wheat cultivars under glasshouse condition. Weeds Research Journal 2: 71-83.
Zand, A., Rahimiyan Mashhadi, M., Dayhim Fard, R. Sofizade, S., and Nassiri Mahallati, M. 2004. Studies on some ecophysiological traits associated with competitiveness of old and new Iranian bread wheat (Triticum aestivum L.) cultivars against wild oat (Avena ludoviciana L.). Iranian Journal of Field Crops Research 1: 160-174. (In Persian with English Summary)
Zare-Faiz-abadi, A., Sareban, H., Rajab-zade, M., and Khazaii, H. 2009. Competitive relationship between wheat cultivars at different densities of wild oat. Iranian Journal of Field Crops Research 7: 465-472. (In Persian with English Summary)