عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Water and nitrogen are the most important factors in plant competition. Since of nitrogen uptake by plants depend on water mass flow, and competition for nitrogen is depend to water availability in soil. In order to study the effect of drought stress and nitrogen application rate on corn-redroot pigweed interaction, a factorial experiment was conducted under greenhouse condition based on replacement series method in which different planting ratios of pigweed and maize component of 0:100, 25:75, 50:50, 75:25 and 100:0 pigweed: corn to corn teaseling stage in 1388 year at Faculty of Agriculture , Ferdowsi University of Mashhad research greenhouse. Treatments included soil water availability in soil at 2 levels (25 and 50 FC) and nitrogen application rate at 3 levels (0, 200 and 400 kg per hectare). Results showed that both corn and pigweed dry mater increased significantly (p≤0.05) with increasing nitrogen application rate in normal soil water condition. It also enhanced corn competitive ability with pigweed. But drought stress decreased both plants dry mater production of both corn and pigweed with nitrogen application. It also had not any advantage for corn yield.
Baumann, D. T., Bastians, L. and Kropff, M. J. 2001. Competition and crom performance in a leek-celery intercropping system. Crop Sci. 41:764-774.
Baumann, D. T., Bastians, L. and Kropff, M. J. 2002. Intercropping system optimization for yield, quality and weed suppression combining mechanistic and descriptive models. Agron. J. 94:734-742.
Blackshaw, R. E. and Molnar, L. J. 2004 Nitrogen fertilizer timing and application method affect growth and competition with spring wheat. Weed Sci. 52:416- 427.
Blackshaw, R. E. 2005. Nitrogen fertilizer, manure and compost effects on weed and competition with spring wheat. Agron. J. 97: 1672-1621.
Blackshaw, R. E., Brandt, R. N. Janzen, H. H., Entz,T., Greant, C. A. and Derksen, D. A. 2003. Differential response of weed species to added nitrogen. Weed Sci. 51:532-539.
Casper, B. B, and Jackson, R. B. 1997. Plant competition underground. Annu. Rev. Syst. 28:545-570.
Cathcart, R. J., and Swanton, C. J. 2003 Nitrogen management will influence threshold values of green foxtail(Setaria viridis) in corn. Weed Sci. 51:975-986.
Frick, B. and Johnson, E. 2002. Growing a competitive crop, first step in weed control. Agro-Food Innovation Fundation, Saskatchewan, Canada. 123:13-24.
Griffin, B. S., Shilling, D. G., Bennet, J. M. and Curry,W. L. 1989. The influence of water stress on the physiology and competition of soybean(Glycin max) and Florida Beggarweed(Desmodium tortosum). Weed Sci. 37: 544-551.
Iftekhar, H. B., Riaz, A., Abdul, J., Nazir, M. S. and Mahmood, T. 2006. Competitive behavior of component crops in different Sesame-Legume intercropping systems. J.of Agric. And Biol. 2:165-167.
Ki-In Kim, D., Clay, E., Carlson, C. G., Clay, S. A. and Trooien, T. 2008.Do synergistic relationships between nitrogen and water influence the Ability of corn to use nitrogen derived from fertilizer and Soil. Agron J. 100:551-556.
Liebman, M. and Davis, A. S. 2000. Integrated of soil, crop and weed management in low external input farming systems. Weed Res. 40:27-47.
Massinga, R. A., Currie, R. S., Trooien, T. P. 2003. Water use and light interception under palmer amaranth (Amaranthuse palmeri) and corn competition. Weed Sci. 51:523-531.
Stuart, B. L., Harrison, S. K., Aberanathy,J. R., Krieg, D. R. and Wendt, C. W. 1984. The response of cotton(Gossypium hirsutum) water relation to smooth pigweed (Amaranthuse hybridus) competition. Weed Sci. 32: 126-132.
Weiget, A. and Jolliffe,.P. 2003. Indices of plant competition. J. of Ecol. 91:707-720.
Weise, A. F, and Vandiver, C. W. 1970. Soil moisture effects on competitive ability of weeds. Weed Sci. 18:518-519.
Zand, E., Rahimian,H., Moussavi, S. K., Ramezani, K. 2002. Weed Ecology Implication for Mnagement (In Persian).
Zimdahl, R. L. 1999. Fundamental of weed science. Academic press. Inc. 460 p.