Competition effects of lambs quarters (Chenopodium album) on physiological characteristics and rapeseed yield (Brassica napus cv. Hyolla 401)

Subject Areas : New Finding in Agriculture

B. Mirshekari ¹ (Department of Agronomy and Plant Breeding, Tabriz Branch, Islamic Azad University, Tabriz, Iran)

Received: 2015-11-27 Accepted : 2015-11-27 Published : 2013-02-19

Keywords: Green Cover, leaf chlorophyle content, economical damage, Hyolla,

Abstract :

         In order to determination of effects of lambsquarters (Chenopodium album L.) on physiological characteristics and yield of rapeseed (Brassica napus L.), cv. Hyolla, a factorial experiment was carried out. Factors were weed densities (4, 8 and 12 plants per meterof row) and relative time of weed emergence (emerged with rapeseed, 15 and 30 days after crop emergence). Crop leaf area index decreased from 3.1 in control to 1.4 in full season interference of 12 weeds per meterof row (121% reduction). Regarding to leaf chlorophyle content, difference between treatments of full season interference of 12 weeds and control was significant. Rapeseed green cover was the highest, when weed emerged 30 days after crop. Crop yield reduced 47%, compared with control, when 12 weeds competed with crop until late growth season. Rapeseed green cover, thousands seed weight and fruit number per plant could totally explain 895 of crop yield changes. Threshold of economical damage of lambsquarter in rapeseed field was in 4 weeds per meter of crop row in 30 days after emergence.

References:

1- Azizi, M., Soltani, A. and Khavari Khorasani, S. 2003. Rapeseed: Physiology, Agronomy, Improvement and Biotechnology. Jihad-e-Daneshgahi of Mashhad University Publications (In Farsi).

2- Black show, W. R., Lemerle, E. D., Mailer, R. and Young. K. R. 2002. Influence of wild radish on yield and quality of canola. Weed Sci. 50: 344-349.

3- Cavero, J., Zaragoza, C., Bastiaans, L., Suso, M. L. and Pardo, A. 2003. The relevance of morphological plasticity in the simulation of competition between maize and Datura stramonium. Weed Res. 40: 163-180.

4- Cruse, D., Ampony, N., Labrada, R. and Merrago, A. 2008. Weed management for developing countries. Blackwell Publishers, Oxford. 

5- Dasdall, L. M., Clagton, G. W., Donovan, J. T. O. and Steven, F. C.  2003.Weed control: Making canola pest management strategies comfortable. Weed Sci. 51: 576-585.

6- Froud- Williams, R. J. and Chanbcellor, R. J. 1987.  A survey of weeds in oilseed rape in central southern England. Weed Res. 27: 187-194.

7- Gibson, N. and Libman, M. 2003.  A laboratory exercise for teaching period for weed control, Weed Tech. 17: 403-411.

8- Gupta, O. P. 2006. Modern weed management, Agrobios publishers, India.

9- Hall, M. R., Swanton, C. J. and Anderson, G. W. 1992. The critical period of weed control in corn (Zea mays). Weed Sci. 40: 441-447.

10- Koucheki, A., Rahimian, H., Nasiri Mahallati, M. and Khiabani, H. 2004. Weed Ecology. Mashhad University Publications (In Farsi).

11- Mc Mullan, P. M., Daun, J. K. and Declereg, D. R. 1994. Effect of wild mustard (Brassica kaber) competition on yield and triazaine susceptible canola (Brassica rapus) and(Brassica rapa). Can. J. Plant Sci. 74: 369-374.

12- Rafael, A. M., Randal, S. C., Michael, J. H. and John, B. J. 2001. Interference of palmer amaranth in corn. Weed Sci. 49: 202- 208.

13- Santos, B. M., Dusky, J. A., Stall, W. M. and Gilreath, J. P. 2004. Influence of common lambsquarter (Chenopodium album L.) densities and phosphorus fertilization on sugarbeet. Crop protection 23: 173-176.

14- Shariati, S. and Shahni zadeh, P. 2001. Rapeseed. Publication of Jehad- Agriculture Ministry, Iran (In Farsi).

15- Spitters, C. J. T. and Vandenberg, J. P. 1982. Competition between crop and weeds: A system approach: In biology and ecology of weeds. Junk Publ. Belmont Univ., Wadsworth.

16- Thomas, P. 1992. Canola Growers Manual, Canola council of Canada.

17- Tollenar, M., Dibo, A. A., Aguilera, A., Weise, S. F. and Swanton, C. J. 1994. Effect of crop density on weed interference in maize. Agron. J. 86: 591-595.

18- Van Acker, R. C., Weise, S. F. and swanton, C. J. 2003.The critical period of weed control soy bean (Glycine max L.). Weed Sci. 41: 194-200.

19- Zeynali, A. and Ehteshami, M. 2003. Biology and controlling of weeds. Gorgan University Publications, Iran (In Persion).