Study the interaction of growth-promoting rhizobacteria and nitrogen on the growth and yield of rice (Oryza sativa L.) in competition with weed

Articles in Press

Document Type : Research Paper

Authors

1 Department of Agronomy, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University

2 Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources

10.22034/saps.2025.64103.3299

Abstract

In order to investigate the effect of plant growth promoting rhizobacteria (PGPR) and nitrogen fertilizer on the yield and yield components of rice in the presence of weeds, a field experiment was carried out on factorial arrangement based on randomized complete block design. Experimental treatments include 1) control (without nitrogen fertilizer and PGPR); 2) 100% nitrogen fertilizer; 3) inoculation with Enterobacter sp. bacteria; 4) inoculation with Ensifer sp. bacteria; 5) inoculation with Burkhoderia capacia bacteria; 6) combined application of Enterobacter bacteria + 50% nitrogen fertilizer; 7) combined application of Ensifer bacteria + 50% nitrogen fertilizer and 8) combined application of Burkhoderia + 50% nitrogen fertilizer as the first factor and two levels of absence and presence of weed as the second factor. According to the results, purple nutsedge (Cyperus rotondus L.), barnyard grass (Echinocloa cruss-galli) and water plantin (Alisma plantago-aquatica L.) weeds were present in the field, and the density and dry weight of these weeds increased due to the application of chemical fertilizer treatment. The highest number of tiller , panicle length and number of panicle were obtained in the combined treatment of Enterobacter + 50% nitrogen. While the highest height, leaf area index thousand grain weight was obtained in the treatment of nitrogen fertilizer application (100%). The highest grain yield (4248 kg.ha-1) and biological yield (9314 kg.ha-1) were observed in Enterobacter + 50% nitrogen treatment in weed-free conditions, which are 49.26 and 33.07% more than the control treatment in the presence of weeds, respectively.

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Journal of Agricultural Science and Sustainable Production

Articles in Press, Accepted Manuscript
Available Online from 22 July 2026

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