Document Type : Research Paper


1 Department of Agronomy, Faculty of Agriculture, Islamic Azad University, Varamin-Pishva Branch, Varamin. Iran. E-mail:

2 Corresponding Author, Department of Agronomy, Faculty of Agriculture, Islamic Azad University, Varamin-Pishva Branch, Varamin. Iran. E-mail:

3 Department of Agronomy, Faculty of Agriculture, Islamic Azad University, Varamin-Pishva Branch, Varamin, Iran. E-mail:

4 Department of Agronomy, Faculty of Agriculture, Islamic Azad University, Varamin-Pishva Branch, Varamin, Iran. E-mail:

5 Department of Microbiology, Faculty of Biological Sciences, Islamic Azad University, Varamin-Pishva Branch, Varamin, Iran. E-mail:



Objective: The purpose of this experiment was to investigate the effect of foliar spraying of bacterial herbicides and aqueous extracts of plants on the morphological characteristics and starch of barnyard grass weed and rice.
Methods: This experiment was conducted as split factorial based on a randomized complete block design cityAmol with three replications in the two cropping years of 2018 and 2019. Factors included the foliar application of aqueous extracts plants and surfactant of sorghum, broccoli, nettle, eucalyptus, elder-berry, Streptomyces sp-albos containing thaxtomin, Xanthomonas campestris bacteria and control as the main factor, the concentration of the extract was zero, 5, 10 and 15 per thousand as a subfactor and the plant species of rice were Tarom cultivar and barnyard grass weed as a sub-sub factor.
Results: By extracts foliar application, barnyard grass seed yield and biological yield decreased and the seed starch percent increased. Rice seed yield in the use of 5 per thousand broccoli extract and 5 per thousand Streptomyces sp-albos was not significantly different from the control. By increasing the concentration of the extract, seed yield and biological yield of rice and barnyard grass showed a further decrease. The lowest seed yield in rice at 3.16 tons/ha was related to elder-berry extract and in barnyard grass 0.68 and 0.61 tons/ha was related to nettle and elder-berry extract.
Conclusion: According to the obtained results, Allelopathy and plant pathogens can be one of the basic ways to control weeds in a sustainable agricultural system.


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