Investigation of growth indices and yield of canola (Brassica napus L.) in competition with wild mustard (Sinapis arvensis L.) as influenced by different amount of nitrogen application

Document Type : Scientific - Research



To evaluate the effect of different levels of nitrogen fertilizer on growth indices and competitive ability of canola (Brassica napus L.) against wild mustard (Sinapis arvensis L.), a split plot trial based on a randomized complete block design with three replications, was carried out at Agricultural Faculty of Bu-Ali Sina University, during 2008-2009. Experimental factors were amounts of nitrogen fertilizer of urea at four levels (100, 150, 200 and 250 kgN.ha-1) and five wild mustard plant densities (0, 4, 8, 16 and 32 plants.m-2). The results showed that wild mustard interference led to reduction of leaf area index (LAI), dry matter accumulation, crop growth rate (CGR), leaf area index duration (LAID), dry matter duration (BMD) and seed yield of canola, while these characteristics were increased with more nitrogen fertilizer application. The maximum indices were obtained at 250 kg N.ha-1 and weed-free condition, but generally, the least reduction in maximum LAI, CGR, LAID and BMD of canola affected by wild mustard competition occurred at 200 kg N.ha-1. In conclusion, the results showed that optimum level of fertilizer 200 kg N.ha-1, increased competitive ability of canola against wild mustard and improved yield and growth indices.


1- Bagherani, N., and Ghadiri, H. 1995. Effect of chemical and mechanical scarification, giberelic acid and temperature on wild mustard germination (Abstract). 12th Congress of Plant Protection, Karaj, Iran. Pp 14. (In Persian)
2- Black Shaw, R.E., Anderson, G.W., and Dekker, J. 1987. Interference of wild mustard (sinapis arvensis L.) and French mercury (Chenopodium album L.) in spring rapeseed (Brassica napus L.). Weed Research 27: 31-34.
3- Blackshaw, R.E., Brandt, R.N., Janzen, H.H., Entz, T., Grant, C.A., and Derksen, D.A. 2003. Differential response of weed species to added nitrogen. Weed Science 51: 532-539.
4- Bosnic, A., and Swanton, C.J. 1997. Influence of barnyardgrass (Echinocloa crus-gali) time of emergence and density on corn (Zea mays). Weed Science 45: 276-282.
5- Cathcart, R.j., and Swanton, C.J. 2004. Nitrogen and green foxtail (Setaria viridis) competition effects on corn growth and development. Weed Science 52: 1039-1049.
6- Cousens, R. 1985. A simple model relating yield loss to weed density. Annual Applied Biology 107: 239-252.
7- Crotser, M.P., and Witt, W.W. 2000. Effect of soybean canopy characteristics, soybean interference and weed-free period on eastern black nightshade (Solanum ptycanthum) growth. Weed Science 48: 20-26.
8- Fernandez, O.N., Vignolio, O.R., and Requesens, E.C. 2002. Competition between corn (Zea mays) and bermudagrass (Cynodon dactylon) in relation to the crop plant arrangement. Agronomy Journal 22: 293-305.
9- Graham, D.L., Steiner, J.L., and Wicse, A.F. 1988. Light absorbtion and competition in mix sorghum-pigweed commutities. Agronomy Journal 80: 415-418.
10- Haefele, S.M., Johnson, D.E., Bodj, D.M., Wopereis, M.C.S., and Miezan, K.M. 2004. Field screening of diverse rice genotypes for weed competitivness in irrigated lowland ecosystems. Field Crop Research 88: 39-56.
11- Hajilari, A., 2005. Canola: Planting and Harvesting. Agriculture Organization of Golestan, 56pp. (In Persian)
12- 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. (Abstract), Weed Science Society American 41:25.
13- Holm, L., Doll, J., Holm, E., Pancho, J., and Herberger, J. 1997. World Weeds, Natural Histories and Distribution. John Wiley and Sons, Inc. New York. 1129 pp.
14- Kazemi Poshtmassari, H., Pirdashti, H., Bahmanyar, M.A., and Nasiri, M. 2007. Study the effects of nitrogen fertilizer rates and split application on yield and yield components of different rice (Oryza sativa L.) cultivars. Pajouhesh v Sazandegi 75:68-77. (In Persian With English Summary)
15- Koocheki, A., and Sarmadnia, G. 2006. Physiology of Crop Plants (Translated). Mashhad Jihad University Press, 400pp. (In Persian)
16- Mohajeri, F., and Ghadiri, H. 2003. Competition of different density of Wild mustard (Brassica kaber) with winter wheat (Triticum aestivum) in different amount of nitrogen fertilizer. Iranian Journal of Agricultural Science 34(3): 527-537. (In Persian With English Summary)
17- MacMullan, P.M., Daun, J.K., and DeClercq, D.R. 1994. Effect of wild mustard (Brassica kaber) competition on yield and quality of triazine-tolerance and triazine-susceptible canola (Brassica napus and Brassica rapa). Canadian Journal Plant Science 74: 369-374.
18- Ngouajio, M., McGiffen Jr.M.E., and Hembree, K.J. 2001. Tolerance of tomato cultivar to velvetleaf interference. Weed Science 49: 91-98.
19- Ni, H., Moody, K., Robles, R.P., Paller, E.C., and Lales, J.S. 2000. Oryza sativa plant traits conferring competitive ability against weeds. Weed Science 48: 200-204.
20- Norris, R.F., Elmore, C. L., Rejmank, M., and Akey, W.C. 2001. Spatial arrangement, density, and competition between barnyardgrass and tomato: I. Crop growth and yield. Weed Science 49: 61-68.
21- Samaei, M., Zand, E., and Daneshian, J. 2004. The effects of different densities of pigweed (Amaranthus retroflexus) on growth indices of soybean (Glycine max L.). Iranian Journal of Field Crop Research 2(1): 13-24. (In Persian With English Summary)
22- Safahani Langrodi1, A.S., Kamkar, B., Zand, E., Bagherani, N., and Bagheri, M. 2007. The effect of growth indices in competitive ability of some canola (Brasica napus) cultivars against wild mustard (Sinapis arvensis). Iranian Journal of Field Crop Research 5(2): 301-313. (In Persian With English Summary)
23- Safahani Langrodi, A.S., Kamkar, B., Zand, E., and Baghestani, M.A. 2008. Evaluation of ability tolerance competition of canola cultivars to wild mustard (Sinapis arvensis) using some empirical models in Golestan province. Journal Agriculture Science Natural Resource 15(5): 101-111. (In Persian With English Summary)
24- Traore, S., Mason, S.C., Martin, A.R., Mortensen, D.A., and Spotanski, J.J. 2003. Velvetleaf interference effects on yield and growth of grain sorghum. Agronomy Journal 95: 1602-1607.
25- Uhart, S.A., and Andrade, F.H. 1995. Nitrogen deficiency in maize: I. Effects on crop growth, development, dry matter partitioning and kernel set. Crop Science 35: 1376-1383.
26- Van Acker, R.C., Swanton, C.J., and Weise, S.F. 1993. The critical period of weed control in soybean (Glycine max (L.) Merr.) growth. Canadian Journal Plant Science 73: 1293-1304.
27- Van Acker, R.C., and Oree, R. 1999. Wild oat (Avena fatua L.) and wild mustard (Brassica kaber) wheller interference in canola (Brassica napus). Weed Science Society American PP. 119.
28- Zand, E., and Beckie, H.J. 2002. Competitive ability of hybrid and open pollinated canola (Brassica napus) with wild oat (Avena fatua). Canadian Journal of Plant Science 82: 473-480.