The Evaluation Allelopathic Effects of Iranian Rice (Qryza Sativa L.)Cultivars on Growth Factors of Barnyard Grass (Echinochloa Cruss –Galli L.)

Document Type : Original Articles


1 Assistant Professor, Department of Agronomy, Faculty of Agriculture, Payame Noor University, Karaj, Iran

2 Professor, Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University Tehran,Iran

3 MSc. of Agronomy, Faculty of Agriculture,Tarbiat Modares University,Tehran, Iran

4 MSc. of Agronomy, Faculty of Agriculture, Payame Noor University, Karaj, Iran

5 Assistant Professor, Department of Irrigation, Faculty of Agriculture, Zanjan University


In order to study theability of hull extracts of Iranian rice cultivars on germination and seedling growth of barnyard grass, two laboratory and greenhouse experiments were conducted ina completely randomized block design with factorial arrangement and three replications. This study wasundertaken to evaluate the allelopathic potential aqueous extract of 20 hull rice (Oryza sativa) cultivars on growth factor of barnyard grass (Echinochloa cruss-galli). This research was performed in 2007 at the Department of Agronomy of Tarbiat Modares University. Aqueous extract of hull rice in four concentrations (control, 5, 10 and 15%) were used for germination test and seedling growth of barnyard grass seeds. In the laboratory, we found that a few varieties product and released allelochemical for inhibiting and more cultivars stimulation growth of barnyard grass. Khazar variety showed the highest inhibition on germination percentage, germination rate, shoot length, root length, root dry weight and shoot dry weight. In addition, the breeding and domestic varieties were inhibitor and simulator of barnyard grass respectively. In the field experiment, Khazar cultivar reduced germination percentage, germination rate, root length, root dry weight, total dry weight and shoot dry weight of barnyard grass and Neda cultivar showed the greatest inhibition on shoot length. This study show that there are differences among the varieties of rice for allelopathic inhibition of barnyard grass seeds and genetic and morphological rice characteristics could be used as selection markets for allelopathic rice varieties and maybe used as a natural herbicide to reduce the population of barnyard grass in field. Increasing concentration of aqueous extract increased effects of inhibition and stimulation of various cultivars on barnyard grass. Survey morphological and genetic traits of rice varieties showed an existing relationship allelopathy potential of rice on barnyard grass.


  1. Torres A, Olive R M, Castella D, Cross p. First world congress on allelopathy.A science of the future. University of Candiz; 1996. p.278.
  2. Rastgar M A. Weed and their control method. Third edition. Tehran uni pub.; 2005. [In Persian]
  3. Golisz A, Sugano M, Fujii Y. Microarray expression profiling of Arabidopsis thaliana L. in response to allelochemicals identified in buckwheat. Journal of Experimental Botany; 2008. 10: 168-173.
  4. Hassan S M, Aidy I R, Bastawisi A O. Allelopathic potential of rice against majogypt. Weed Science Society. Washington, USA. 1995. p.78.
  5. Chung. I M, Ahn J K, Yun S J. Identification of allelopathic compounds from rice straw and their biological activity. Journal of Plant Science; 2001. 81: 815-819.
  6. Chung I M, Kim K, Ahm J K, Lee B, Kim S O, Hahn S J. Comparison of allelopathic potential of Rice leaves, straw and Hall Extracts on Barnyard grass. Agronomy Journal; 2003. 95: 1063-1040.
  7. Seyyednejad S M, Koochak H, Najafabade F P, Kolahi M. Allelopathic effect of aquatic hull extract of rice (Oryza sativa L.) on growth of Silybum marianum and Echinochloa crus-galli. African Journal of Agricultural Research; 2010. 5: 2222-2226.
  8. Khajeh hosseini M, Orooji K, Avarseji Z. Evaluation of some seed dormancy breaking methods on twenty weeds species. The 3rd Iranian Weed Science Congress. 2010. p.167.
  9. Ahn J K, Change I M. Allelopathic potential of rice hull germination and seedling rowthof barnyardgrass. Ronomyjournad; 2000. 92: 1162-1167.
  10. Heidarzade A, Pirdashti H, Esmaeili M A, Matine A A. Evaluating inhibitory potential of rice cultivars (Oryza sativa L.) root exudates on characteristics of Barnyardgrass (Echinochloa crus-galli) weed. Electronic Journal of Crop Production; 2010. 2(3):177-192. [In Persian]
  11. Esmaeili M, Heidarzade A, Pirdashti H, Esmaeili, F. Inhibitory activity of pure allelochemicals on Barnyardgrass (Echinochloa crus-galli L) seed and seedling parameters. International Journal of Agriculture and Crop Sciences; 2012. 4: 274-279.
  12. Kim KU, Shin D H. Rice allelopathy research in Korea. Weed Science; 1996. 10(3)221-226.
  13. Salam M A, Morokuma M, Teruya T, Suenaga K, Kato-Noguchi H. Isolation and identification of a potent allelopathic substance in Bangladesh rice. Plant Growth Regulatur; 2009. 58: 137-140.
  14. Asghari j, Moosavi y. Allelopathic effects of the cultivars of rice on barnyard grass seed and weed seed yellow nutsedge. Plant Diseases Conference; 2002. 3: 133 to 143. [In Persian]
  15. Xuan T D, Hong N H, Khan T D, Fiji T, Tawata S, Fukuta M. Utilization of plant allelopathy for biological control of weeds and plant pathogens in rice. 13Th Australian Agronomy Conferences; 2006. p221.
  16. Olofsdotter M, Navare D. Allelopatic rice for Echinochloacruss –galli control .2nd International Weed Control Congress.Denmark; 1996. p:1175-1181.
  17. Kim S Y, Madrid S T, Park S, Yang J, Olofsdotter M. Evaluation of rice allelopathy in hydroponics. Weed Research; 2004. 45:74-79.