Ampong-Nyarko, K. and de Datta, S. K. 1993. Effects of nitrogen application on growth, nitrogen use efficiency and rice-weed interaction. Weed Res. 33:269–276.
Baghestani, M. A., zand, E., Soufizadeh, S., Eskandari, A., Pourazar, R., Veysi, M. and Nassirrzadeh, N. 2007. Efficacy evaluation of some dual purpose herbicide to control weeds in maize (Zea mays L.).Crop Protection.26:936-942.
Blackshaw, R. E. and Brandt, R. N. 2008. Nitrogen fertilizer rate effect on weed competitiveness is species dependent. Weed Sci. 56:743-747.
Blackshaw, R. E., O’Donovan,J. T. Harker,K. N. Clayton,G. W. and Stougaard, R. N. 2006. Reduced herbicide doses in field crops: a review. Weed Biol. Manag. 6:10–17.
Blackshaw, R. E., Brandt, R. N., Janzen, H. H., Grant,C. A. and Derksen, D. A. 2003. Differential response of weed species to added nitrogen. Weed Sci. 51:532–539.
Blackshaw, R. B., Semach,G. and Janzen, H. H. 2002. Fertilizer application method affects nitrogen uptake in weeds and wheat. Weed Sci. 50:634-641.
Carlson, H. L. and Hill.J. E. 1986. Wild out (Avena fatua) competition with spring wheat: Effects of nitrogen fertilization. Weed Sci. 34:29-33.
Cathcart, R. J. and Swanton, C. J. 2003. Nitrogen management will influence threshould values of green foxtail (Setaria viridis) in corn. Weed. Sci. 51:975-986.
Cathcart, R. J., Chandler, K. and Swanton, C. J. 2004. Fertilizer rate and response of weeds to herbicides. Weed Sci. 52:291–296.
DiTomaso, J. M. 1995. Approaches for improving crop competitiveness through the manipulation of fertilization strategies. Weed Sci. 43:491–497.
Kim, D. S., Marshall, E. J. P., Caseley, J. C. and Brain, P. 2006. Modeling interactions between herbicide and nitrogen in terms of weed response. Weed Res. 46:490–501.
Kim, D. S., Marshall, E. J. P., Caseley, J. C. and Brains, p. 2006. Modelling the effects of sub-lethal doses of herbicide and nitrogen fertilizer on crop–weed competition. Weed Res.46:492-502.
Kropff, M. J. and Van Laar, H. 1993. Crop weeds interaction. CAB international, wallingfond UK.
Kropff, M. J. and Lotz, L. A. P. 1992. Systems approaches quantify crop – weed interactions and their application in weed management Agricultural systems. Weed Sci. 40: 265-282.
Liebman, M. and Davis, A. S. 2001. Integration of soil, crop and weed management in low-external-input farming systems. Weed Res. 40: 27–47.
Liebman, M. 1989. Effect of nitrogen fertilizer, irrigation, and crop genotype on canopy relations and yields of an inter/weed mixture. Field Crops Res. 22:83-100
Loomis, R. J. and Connar, D. J. 1992. Soil management. Pages 319-348.in crop ecology. Productivity and management in agriculture system.Cambridag Univ.press, New York.
Mithila, J., Swanton, C. J. Blackshaw,R. E. cachcart, R. J. and Hall,J. C. 2008. Physiological bassis for reduced Glyphosate efficacy on weeds growth under low soil nitrogen. Weed Sci. 56.12-17.
Rajcan, I. and Swanton, C. J. 2001. Understanding maize-weed competition: resources competition, light quality and the whole plant. Field Crops. Res. 71:139–150.
Swanton, C. J., Shrestha, A., Roy, R. C., Ball-Coelho,B. R. and Knezevic, S. Z. 1999. Effect of tillage systems, N, and cover crop on the composition of weed flora. Weed Sci. 47:454–461.
Teyker, R. H., Hoelzer, H. D. and Liebl, R. A. 1991. Maize and pigweed response to nitrogen supply and form. Plant Soil. 135:287–292.