Document Type : Research Paper



In order to study the effect of crop residue management (C.R.M) and nitrogen splitting (N-splitting) methods on yield and yield components of canola, a filed experiment was conducted in Research Station of Shahid Chamran University in 2005-2006, 2006- 2007 (first year wheat, second year canola). The experiment was set up in a split plot design with three replications. The main plot treatments were C.R.M (i.e. incorporation, removal and burning the wheat residue) and sub plot treatments were N-splitting with combination of nitrogen- based and top dressing of nitrogen applied at three levels (i.e. 50+50, 25+75 and 25+50+25 %). The measurement of plant characteristics, plant density and sum of dry matter of weeds were used to evaluate plant growth and standing within canola population. The results indicated that weed plants greatly declined regardless of type of weed species, when the plant residues were incorporated into the soil. Further reduction could significantly inhibit weed growth and nitrogen source applied in form of N-splitting (50+50%). Findings also showed that the highest (19.4 plant/m2) and lowest (5.1 plant/m2) weed plants were observed under burning the residues treatment receiving 25+75 % N- splitting and incorporation of the residue treatment receiving 25+50+25 % N- splitting respectively. The highest (153.8 g/m2) and lowest (43.2 g/m2) yield production of dry matter of weed populations were accumulated when the residues were burned and received 25+75 % N- splitting incorporated and receiving 25+50+25 % N- splitting respectively. in the present study, the evidence indicated a desirable method of crop residue management when incorporating the residues in form of N- splitting (50+50 %).



    1. راشد محصل، م. ح. و موسوی، ک. 1385. اصول مدیریت علف های هرز. انتشارات دانشگاه فردوسی مشهد، 545 صفحه.
    2. زند، ا.، رحیمیان مشهدی، ح.، کوچکی، ع.، خلقانی، ج.، موسوی، ک. و رمضانی، ک. 1383. اکولوژی علف های هرز (کاربردهای مدیریتی). انتشارات دانشگاه فردوسی مشهد، 558 صفحه.
    3. Aynehband, A. 2008. Cultivar and nitrogen effects on amaranth forage yield and weed community. Pakistan Journal of Biological Science, 11: 80-85.
    4. Dhima, K., and Eleftherohorinos, L. 2001. Influence of nitrogen on competition between winter cereal and sterile oat. Weed Science, 49: 77-82.
    5. Fernandez, R., Quiroga. A., E., Funaro. D., Montoya. J., Hitzmann. B., and Peinemann, N. 2006. A study of effect of the interaction between site- specific conditions- residue cover and weed control on water storage during fallow. Agricultural Water management, 95: 1028-1040.
    6. Kurstjens, D.G. 2007. Precise tillage systems for enhanced non chemical weed management. Soil and Tillage Research, 97: 293-305.
    7. Lopez-Bellido, L., Lopez- Bellido, R., and Redondo, R. 2005. Nitrogen efficiency in wheat under rainfed Mediterranean conditions as affected by split nitrogen application. Field Crops Research, 94: 86-97.
    8. S., Partner, T.S., and Stapleton, J. 2007. Interaction effects of Allium Ssp. Residues concentrations and soil temperature on seed germination of four weedy plant species. Applied Soil Ecology, 37: 233-239.
    9. Menan, H., Ngouajio, M., Isik, D., and Kaya, E. 2006. Effect of alternative management systems on weed populations in hazelnut (corylus avellana). Crop Protection, 25: 835-841.
    10. Moss, S.R. 1987. Influence of tillage, straw disposal system and seed return on the population dynamics of Alopecurus myosuroides In winter wheat. Weed Research, 27: 313-320.
      1. Scursoni, J., and Arnold, R. 2002. Effect of nitrogen fertilization timming on the demographic procceses of wild oat in barely. Weed Science, 50: 616-621.
      2. Walsh, M., and Newman, P. 2006. Burning narrow windrows for weed seed destruction. Field Crops Research, 104: 24-30.
      3. Whybrew, J.E. 1964. The survival of wild oats (Avena fatua) under continuous spring barely growing. Proceeding of the 7 th British Weed Control Conference. PP: 614-620.
      4. Zimmerman, C.A. 1976. Growth characteristics of weediness in portulace oleracea Ecology, 57: 964-979.