تأثیر تراکم علف‌هرز و سطوح مختلف کود نیتروژن بر شاخص‌های رشدی ذرت (Zea mays L.)، تاج خروس ریشه قرمز (Amaranthus retroflexus L.) و ارزن (Panicum miliaceum L.)

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشکده کشاورزی، دانشگاه زابل

2 دانشگاه شهید بهشتی

چکیده

به منظور بررسی تأثیر تراکم علف‌هرز و سطوح مختلف کود نیتروژن بر شاخص‌های رشدی ذرت (Zea may L.)، تاج خروس ریشه قرمز (Amaranthus retroflexus L.) و ارزن (Panicum miliaceum L.)، آزمایشی در سال 1388 در مزرعه تحقیقاتی دانشکده کشاورزی تربیت مدرس به صورت فاکتوریل سه عاملی در قالب طرح بلوک‌های کامل تصادفی در سه تکرار انجام پذیرفت. بر همین اساس، سه عامل کود نیتروژن (138، 184 و 230 کیلوگرم نیتروژن خالص در هکتار)، گونه علف‌هرز (تاج خروس و ارزن) و تراکم علف‌هرز (به‌ترتیب 5 و 25 بوته در متر‌مربع برای تاج خروس و 5/7 و 5/37 بوته در متر مربع برای ارزن) در نظر گرفته شد. نتایج نشان داد که بیشترین مقدار وزن ماده خشک کل (39/2429 گرم) در تیمارهای کنترل علف‌هرز و 230 کیلوگرم نیتروژن خالص در هکتار به‌دست آمد. ذرت در رقابت با علف‌هرز ارزن بیشینه سرعت رشد محصول را در تیمار کم علف‌هرز و 138 کیلوگرم نیتروژن خالص در هکتار کسب کرد. همچنین ذرت در رقابت با تاج خروس بیشینه سرعت رشد محصول و بیشینه سرعت رشد نسبی را به ترتیب با مقدارهای 83/30 گرم بر مترمربع در روز و 055/• گرم بر گرم در تیمار کم علف‌هرز و 138 کیلوگرم نیتروژن خالص در هکتار کسب کرد. به‌طور کلی نتایج مشخص کرد، در مزراعی که علف‌هرزهای نیتروژن دوستی مانند تاج خروس غالب هستند، افزایش میزان مصرف کود نه تنها موجب افزایش ماده خشک و شاخص سطح برگ ذرت نمی‌شود، بلکه ضمن کاهش آن‌ها، موجبات آلودگی بیشتر محیط زیست را فراهم می‌آورد.

کلیدواژه‌ها


عنوان مقاله [English]

Influence of Weed Densities and Different Nitrogen Levels on Growth Indices of Corn, Red Root Pigweed (Amaranthus retroflexus L.) and Millet (Panicum miliaceum L.)

نویسندگان [English]

  • Vahid Mohammadi 1
  • Sajjad Rahimi Moghaddam 2
1 Zabol University
2 Shahid Beheshti University
چکیده [English]

Introduction
Competition for nutrient sources, especially nitrogen, is one of the reasons of corn yield reduction in the presence of weed. Weeds compete with corn for nitrogen uptake and affect its growth and development. Thus management and optimum application of nitrogen fertilizer may help corn to compete against weeds. More consumption of nitrogen fertilizer would change the competition ability of weed and crop. Comparison of crop-weed growth-related characteristics is a way to assess their rate of competition. The main objective of the current study was to evaluate the effects of different weed densities and nitrogen levels on growth indices of corn, red root pigweed and millet.
Material and Methods
In order to study the effects of different weed densities and nitrogen levels on growth indices of corn, red root pigweed (Amaranthus retroflexus) and millet (Panicum miliaceum), a field experiment was conducted in 2009 in the research fields of Tarbiat Modares University of Tehran with factorial arrangement of treatments based on Randomized Complete Block Design with three replications. Accordingly, three factors included different nitrogen fertilizers (75% optimum or 138 kg N/ha, optimum or 184 kg N/ha and 125% optimum or 230 kg N ha), weed species (redroot pigweed and millet) and weed densities (5 and 25 plants.m-1 for redroot pigweed and 7.5 and 37.5 plants.m-1 for millet) was considered as main plot. Destructive sampling was carried out in four stages (including mid-vegetative growth [35 days after planting], Tasseling [62 days after planting], milky stage [84 days after planting] and physiological maturity [130 days after planting]), to measure changing trend of the leaf area and dry matter in corn, red root pigweed and millet. Four plants were used at each destructive sampling. The OriginPro 9.1 software was used to fit equations and draw figures.
Results and Discussion
The highest dry matter (2429.39 gr), CGR (38.38 gr m-1 day-1) and LAI (4.57) was achieved for the treatment of 230 kg N ha-1 and weed control. However, the highest RGR with 0.06 g.g-1 was obtained in at the treatment of 184 kg N ha-1 and weed control. Corn in competition with millet was achieved the maximum CGR in 138 kg N ha-1 and 7.5 millet m-1 and also the maximum RGR was obtained in 184 kg N ha-1 and 7.5 millet m-1. Corn in competition with redroot pigweed was achieved the maximum CGR (30.83 gr m-1 day-1) and RGR (0.055 gr) in 138 kg N ha-1 and 5 redroot pigweed m-1 and also the maximum TDW (1815.92) and LAI (5.1) belonged to in 184 kg N ha-1 and 5 redroot pigweed m-1. Generally, analyzing the trends of growth indicators shows that the corn growth indices are reduced more by increasing the weed density in high levels of nitrogen and as a result, the competitive ability of weeds is more in high levels of nitrogen. The Millet and redroot pigweed growth indices show that their maximum TDW, CGR and RGR (In all different levels of nitrogen and weed densities) occurred at 62 days after planting. However, they have different values and trends at different levels of nitrogen and weed densities.
Conclusion
The results of this study show that the species of weeds in the farm is a determinative factor impress on the role of increasing application of Nitrogen for improving dry matter production and growth indices of corn. Totally, the results indicate that increasing N application beyond the optimum rate not only do not increases corn growth but also reduces its yield, where nitrophile species are the dominants in farms, and leads to environmental pollution .

کلیدواژه‌ها [English]

  • Density
  • Dry matter
  • Leaf Area Index
  • Nitrophile
  • Weed
Baghestani, M.A., Zand, E., Soufizadeh, S., Eskandari, A., PourAzar, R., Veysi, M., and Nassirzadeh, N. 2007. Efficacy evaluation of some dual purpose herbicides to control weeds in maize (Zea mays L.). Crop Protection 26: 936- 942.
Barker, D.C., Knezevic, S.Z., Martin, A.R., Walters, D.T., and Lindquist, J.L. 2006. Effect of nitrogen addition on the comparative productivity of corn and velvetleaf (Abutilon theophrasti). Weed science 54: 354-363.
Battery, B.R. 1969. Analysis of the growth of soybeans as affected by planting population and fertilizer. Canadian Journal of Plant Science 49: 675-689.
Beheshti, S.A., and Moosavi Sarveeneh Baghi, S.R. 2009. Pigweed (Amaranthus retroflexus L.) competition effects on grain and biomass yield of sorghum (Sorghum bicolor L. Moench). Iranian Journal of Field Crops Research 25(1): 33-49. (In Persian with English Summary)
Blackshaw, R.E. 1993. Downy brome (Bromus tectotrum) density and relative time of emergence affects interference in winter wheat (Triticum aestivum). Weed Science 41(4): 551- 556.
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.
Connor, D.J., Loomis, R.S., and Cassman, K.G. 2011. Crop Ecology: Productivity and Management in Agricultural Systems. Cambridge University Press, London, England 576 p.
Cousens, S.R. 1985. A simple model relating yield loss to weed density. Annals of Applied Biology 107(2): 239-252.
Dunan, M.C., and Zimdahl, R.L. 1991. Competitive ability of wild oats (Avena fatua) and barley (Hordeum vulgare). Weed Science 39: 558-563.
Food and Agricultural Organization (FAO). 2012. The FAOSTAT Database, Available at Web site http://faostat.fao.org/default.aspx (verified 1 January 2016).
Gill, G., and Davidson, R. 2000. Weed interference. In. B.M. Sindel (Eds.). Australian Weed Management Systems. RG and FJ Richardson, Meredith. p. 61-80.
Goksoy, A.T., Demir, A.O., Turan, Z.M., and Dagustu, N. 2004. Responses of sunflower to full and limited irrigation at different growth stages. Field Crops Research 87(2): 167-178.
Goudriaan, J., and Van Laar, H.H. 1994. Modelling Potential Crop Growth Processes. Springer Science and Business Media, Dordrecht, Netherlands 238 p.
Hall, R.C., and Sowanton, G.A. 1994. The critical period of weed control in grain corn (Zea mays). Weed Science 40: 441-447.
Hani, A., Elteliba, M., Hamad, A., and Eltom, E.A. 2006. The effect of nitrogen and phosphorus fertilization on growth, yield and quality of forage maize (Zea mays L.). Agronomy Journal 5(3): 515-518.
Hargood, E.S., Bauman, J.T., Williams, J.L., and Schreiber, M.M. 1981. Growth analysis of soybean (Glycin max L.) in competition with jimsonweed (Datura stramonium L.). Weed Science 29: 500-504.
James, T.K., Rahman, A., Trivedi, P., and Zydenbos, S.M. 2010. Broom corn millet (Panicum miliaceum): a new menace for maize and sweetcorn growers in New Zealand. In Proceedings of the 17th Australasian Weeds Conference, Christchurch, New Zealand, Australia, 26-30 September 2010 p. 32-34.
Jans, W.W.P., Jacobs, C.M.J., Kruijt, B., Elebrs, J.A., Barendse, S., and Moors, E.J. 2010. Carbon exchange of a maize (Zea mays L.) crop: Influence of phenology. Agriculture, Ecosystems and Environment 139: 325-335.
Kazemeini, S.A., Naderi, R., and Karimi Aliabadi, H. 2013. Effects of different densities of wild oat (Avena fatua L.) and nitrogen rates on oilseed rape (Brassica napus L.) yield. Journal of Ecology and Environment 36(3): 167-172.
Knezevic, S.Z., Horak, M.J., and Vanderlip, R.L. 1997. Relative time of redroot pigweed (Amaranthus retroflexus L.) emergence is critical in pigweed-sorghum (Sorghum bicolor L. Moench.) competition. Weed Science 45: 502-505.
Knezevic, S.Z., Weise, S.F., and Swanton, C.J. 1994. Interference of redroot pigweed (Amaranthus retroflexus) in corn (Zea mays). Weed Science 1: 568-573.
Lemerle, D., Gill, G.S., Murphey, C.E., Walker, S.R., Cousens, R.D., Mokhtari, S., Peltzer, S.J., 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.
Liu, Y., Li, S., Chen, F., Yang, S., and Chen, X. 2010. Soil water dynamics use efficiency in spring maize (Zea mays L.) fields subjects to different water management practices on the loess Plateau, China. Agricultural Water Management 97: 769-775.
Mahmoudi, G., Ghanbari, A., and Hosein Panahi, F. 2014. Evaluating of physiological indices of weed species at different density on corn (Zea mays L.) growth. Iranian Journal of Field Crops Research 12(1): 118-126. (In Persian with English Summary)
Massinga, R.A., Currie, R.S., and Trooien, T.P. 2003. Water use and light interception under Palmer amaranth (Amaranthus palmeri) and corn competition. Weed Science 51(4): 523-531.
Mohammadi, G.R. 2007. Growth parameters enhancing the competitive ability of corn (Zea mays L.) against weeds. Weed Biology and Management 7: 232-236.
Munns, R., and Passioura, J.B. 1984. Effect of prolonged exposure to NaCl on the osmstic pressure of leaf xylem sap from intact, transpiring barley plants. Functional Plant Biology 11(6): 497-507.
Naderi, R., and Ghadiri, H. 2010. Competition of wild mustard (Sinapis arvense L.) densities with rapeseed (Brassica napus L.) under different levels of nitrogen fertilizer. Journal of Agricultural Science and Technology 13: 45-51.
Oerke, E.C., and Dehne, H.W. 2004. Safeguarding production losses in major crops and the role of crop protection. Crop Protection 23: 275-285.
Panda, R.K., Behera, S.K., and Kashyap, P.S. 2004. Effective management of irrigation water for maize under stressed conditions. Agricultural Water Management 66: 181-203.
Radosevich, S.R., and Holt, J. 1984. Weed Ecology: Implications for Vegetation Management. John Wiley and Sons, New York, USA 589 p.
Rahimi Moghaddam, S., Deihimfard, R., Soufizadeh, S., Kambouzia, J., Nazariyan Firuzabadi, F., and Eyni Nargeseh, H. 2015a. The effect of sowing date on grain yield, yield components and growth physiological indices of six grain maize cultivars in Iran. Journal of Agroecology 5(1): 72- 83. (In Persian with English Summary)
Rahimi Moghaddam, S., Deihimfard, R., Soufizadeh, S., Kambouzia, J., Nazariyan Firuzabadi, F., and Eyni Nargeseh, H. 2015b. Determination of genetic coefficients of some maize (Zea mays L.) cultivars of Iran for application in crop simulation models. Iranian Journal of Field Crops Research 13(2): 328-339. (In Persian with English Summary)
Rohrig, M., and Stutzel, H. 2001. A model for light competition between vegetable crops and weeds. European Journal of Agronomy 14: 13-29.
Schippers, P, and Kropff, M.J. 2001. Competition for light and nitrogen among grassland species: a simulation analysis. Functional Ecology 15: 155-164.
Seifert, E. 2014. OriginPro 9.1: Scientific data analysis and graphing software-software review. Journal of Chemical Information and Modeling 54(5): 1552-1552.
Sepehri, A., Modarres Sanavi, S.A., Gharehyazi, B., and Yamini, Y. 2002. Effect of water deficit and different nitrogen rates on growth and development stages, yield and yield component of maize (Zea mays L.). Iranian Journal of Crop Sciences 4: 184-200. (In Persian with English Summary)
So, Y.F., Williams, M.M., Pataky, J. K., and Davis, A.S. 2009. Principal canopy factors of sweet corn and relationships to competitive ability with wildproso millet (Panicum miliaceum). Weed science 57: 296-303.
Teasdale, J.R., and Cavigelli, M.A. 2010. Subplots facilitate assessment of corn yield losses from weed competition in a long-term systems experiment. Agronomy for Sustainable Development 30: 445-453.
Teyker, R.H., Hoelzer, H.D., and Liebl, R.A. 1991. Maize and pigweed response to N supply and form. Plant Soil 135: 287-292.
Tollenaar, M., Nissanka, S., Aguilera, P., Weise, A., and Swanton, C.J. 1994. Effect of weed interference and soil nitrogen on four maize hybrids. Agronomy Journal 86: 596-601.
Vail, G.D., and Oliver, L.R. 1993. Barnyardgrass (Echinochloa crus-galli) interference in soybeans (Glycine max). Weed Technology 1: 220-225.
Weiner, J., Griepentorg, H.W., and Kristensen, L. 2001. Suppression of weed by spring wheat (Triticum aestivum) increases with crop density and spatial uniformity. Journal of Applied Ecology 38: 784-790.
Werker, A.R., and Jaggard, K.W. 1997. Modelling asymmetrical growth curves that rise and fall: Applications to foliage dynamics of sugar beet (Beta vulgaris L.). Annals of Botany 79(6): 657-665.
Wilson, R.G., and Westra, P. 1991. Wild proso millet (Panicum miliaceum) interference in corn (Zea mays). Weed Science 1: 217-220.