Document Type : Original Article


Department of Plant Eco-Physiology, University of Tabriz, Tabriz, Iran


Objective: Field experiment was conducted in 2009 to investigate the effects of plant density and weed interference on morphological characteristics and yield of corn (Zea Mays, L.) at Research Station of University of Tabriz, Tabriz, Iran. Methods: The experiment was arranged as split plot based on randomized complete block design with three replications. Plant density (D1, D2, D3 and D4: 5, 7, 10 and 16 plant m-2, respectively) were assigned to main plots and three levels of weed interference ((W1, W2 and W3:  weed free, between row weed interference and full-season weed interference) were allocated to the sub plots. Results: The Results showed that with increasing plant density, grain and biological yield increased, but cob weight, ear length, ear diameter and harvest index decreased. The highest amount of morphological traits and harvest index was obtained from 5 plant m-2.The weed interference treatments had significant effects on above traits so the highest morphological traits, grain yield, biological yield and harvest index was obtained from weed free treatment. These results indicated that high plant densities because of decreasing weed interference and increasing grain and biological yield, is the effective agronomic solution for increasing corn performance in the field and can be used to reduce consumption of chemical pesticides in sustainable agriculture systems.


Charles, A.S., Charles, S.W., 2006. Corn response to nitrogen rate, row spacing, and plant density in Eastern Nebraska. Agron. J. 98, 529-535.
Cox, W.J., 1996. Whole plant physiological and yield responses of maize to plant density. Agron. J. 88, 489-496.
Faravani, M., 1995. Effects of planting date and plant density on yield and yield components of corn (Zea Mays L.) in Karaj, Iran's.M.Sc. Thesis, Department of Agronomy, Tehran University, Iran.
Fateh, E., Sharifzadeh, F., Mazaheri, D., Baghestani, M.A., 2007. Evaluation of competition ability between corn (Zea mays) and squarter (Chenopodium album) influenced by planting pattern and their effect on corn
yield components.
Feyzbakhsh, M.T., Mokhtarpour, H., Mosavat, S.A., Mohager, M., Shahee, G.H.A., 2007. Effects of sowing date and plant density on forage yield and some morphological characteristics of corn (SC. 704).
Electronical Crop Production Journal. 3(1), 217-224. 
Hajebrahimi, A., Nasrollahzadeh, S., Shafagh-Kolvanagh, J., Aghaie-Garachorlu, P., 2014. Effect of nitrogen rates on critical period for weed control and yield of corn (Zea mays). Scientific J. Crop Sci. 3, 17-23.
Hashemi-Dezfouli, A., Herbert, S.J., 1992a. Effect of leaf orientation and density on yield of corn. Agric. Res. 11, 89-104.
Isik, D., Mannan, H., Bukan, B., Oz, A., Ngouajiro, M., 2006. The critical period for weed control in corn in turkey. Weed Technol. 20, 867-872.
Mather, K., 1961. Competition and cooperation. p. 264– 281. In Mechanisms in Biological Competition: Soc. for Exp. Bio. Symp. XV. Academic Press, New York.
Normohamadi, G.H., Sadat, S., Kasbani, A., 1997. Agronomy (cereal). Ahvaz University, (1): 428.
Rahimian, H., Shariati, S.H., 1999. Modeling crop-weed interactions (Translated). Agriculture Teaching Publisher. PP. 294.
Sadgei, H., Bohrani, M.J., 2002. Effects of plant density and nitrogen rates on yield and yield components of corn (Zea mays L.). Ir. J. Crop Sci. 3, 403-412.
Zamanian, M., Najafi, E., 2002. Assessment of row spacing and plant density effects on silage yield and morphological characteristics of corn cv. KSC 704. Seed Plant. 18, 200-214.