Amiri A, Tohidi Nejad E , Javaheri MA and Mohamadi Nejad Q. 2010. Study the effect of planting time, cultivar and Azotobacter on wheat (Triticum aesticum L.) yield at Bardsir region. Journal of Crops Improvement, 12(1): 11-19. (In Persian).
Arzanesh MH, Alikhani HA, Khavazi K, Rahimian HA and Miransari M. 2011.Wheat growth enhancement by Azospirillum sp. under drought stress. World Journal of Microbiology and Biotechnology, 27: 197-205.
Asghar HN, Zahir ZA, Arshad M and Khaliq A. 2004. Relationship between in-vitro production of auxins by rhizobacteria and their growth-promoting activities in Brassica juncea L. Biology and Fertility of Soils. 35: 231-237.
Ashfaq Anjum M, Zahir ZA, Ashraf M and Arshad M. 2011. Isolation and screening of rhizobia for auxin biosynthesis and growth promotion of mung bean (Vigna radiata L.) seedlings under axenic conditions. Soil Environment, 30(1): 18-26.
Broughton WJ and Ouler S. 1986. Nitrogen fixation. Volume 4: Mollecularbiology. Clarendon press. Oxford.
Choudhury A and Kabi MC. 2002. Response of rice to inoculation with acomposite inoculums under graded levels of fertilizers nitrogen Hindu-Kohterai soils of West Bengal. Indian Agriculturist, 46 (3/4): 173 – 175.
Dixon ROD and Wheeler CT. 1986. Nitrogen Fixation in Plants. Chapman and Hall. NewYork.
Dobereiner J and BaldaniVLD. 1998. New biotechnologies. Biotechnology Science. Dev. Bras. 1: 16- 17.
Dobereiner J. 1997. Biological nitrogen fixation in the tropics, social and economic contributions. Soil Biology and Biochemistry, 29: 771-774.
Fallah Qazaani M, Habibi D, Pazoki AR and Khavazi K.2012 .Effect of some Azotobacter spices and humic acid on auxin hormone production, yield and yield components of wheat under different nitrogen levels. Iranian Journal of Agronomy and Plant Breeding, 8(2): 97-109. (In Persian).
FAO. 2005. Fertilizer use by crop in the Islamic Republic of Iran. Rome.
Gonzalez-lopes J, Martinez-Toledo MW, Reina S and Slmern V. 1991. Root exudates of maize and productionof auxins, gibberellins, cytokinins, amino acids and vitamins by Azotobacter chroococcum in chemically definedmedia and dialyzed-soil media. Technology and Environment Chemistry, 33:69-78.
Gonzalez-lopes J, Slmern V and Moreno J. 1983. Amino acid and vitamins produced by Azotobacter vinelandii inchemically- defined media and dialyzed soil media. Soil Biology and Biochemistry, 6: 711- 713.
Hajeeboland R, Aliasgharzadeh N, Mehrfar Z. 2004. Ecological Study of Azotobacter in Two pasture lands of the North-west Iran and its Inoculation Effect on Growth and Mineral Nutrition of Wheat (Triticum aestivum L. cv. Omid) Plants. Journal of Water and soil Science, 8 (2):75-90. (In Persian)
Jimenez DJ, Salvador Montana J and Mercedes Martinez M. 2011. Characterization of free nitrogen fixing bacteria of the genus Azotobacter in organic vegetable grown Colombian soils. Brazilian Journal of Microbiology, 42: 846-858
Kader MA, Main MH and Hoque MS. 2002. Effect of Azotobacter inoculants on the yield and nitrogenuptake by wheat. Biological Science, 2: 259–261.
Kanaani Alvar A, Raei Y, Zehtab Salmasi S and Nasrollahzadeh S. 2013.Study the Effects of Biological and Nitrogen Fertilizers on Yield and SomeMorphological Traits of two Spring Barley (Hodeum vulgare L.) Varieties underRainfed Conditions. Agricultural and Sustainable Production Knowledge, 23(1): 20-29. (In Persian).
Kanimozhi K and Panneerselvam A. 2010. Studies on isolation and nitrogen fixation ability of Azospirillum spp. isolated from Thanjavur district. Der Chemica Sinica, 1(3): 138-145.
Karaivazoglou NA, Papakosta DK and Divanidis S. 2005. Effect of chloride in irrigation water andform of nitrogen fertilizer on Virginia (flue-cured) tobacco. Field Crops Research, 92: 61-74.
Kennedy IR, Choudhury ATMA and Kecskes ML. 2004. Non-symbiotic bacterial diazotrophs in crop-farming systems: can their potential for plant growth promotion be better exploited? Soil Biology and Biochemistry, 36:1229–1244.
Maghsoudi E, Ghalavand A, Alikhani MA. 2013. Effects of Organic, Chemical, Biological, and Integrated Nutritional Systems on Yield and Quality Traits of Maize Variety S.C.704. Iranian Journal of Field Crops Research, 12 (2): 273-282. (In Persian).
Malakouti MJ and Gheibi N. 1997. Determine the critical nutrients strategic and proper fertilizer recommendations in the country. Publication of agricultural education. Karaj. Iran. (In Persian).
Marschner H. 1995. Mineral nutrition of higher plant. Academic press. London.
Martin P, Glatzle A, Kolb W, Omay H and Schmidt W. 1989. N2-fixing bacteria in the rhizosphere: Quantification and hormonal effects on root development. Z. Pflanzenernaehr. Bodenk. 152: 237-245.
Martinz-Toledo M V, Gonzalez-Lopez J, De La Rubia T and Moreno J. 1988. Effect of inoculation with A. chroococcum on nitrogenase activity of Zea mays roots grown in agricultural soil under aseptic and non-sterile conditions. Biology and Fertility of Soil, 6: 170-173.
Martinz-Toledo MV, Rofelas B, Salmeron V, Pozo C and Gonzalez-Lopez J. 1996. Production of pantothenicacid and thiamine by Azotobacter vinelandii in a chemically defined medium and a dialyzed soil medium. Biology andFertility of Soil, 22: 131-135.
Mazinani Z, Aminafshar M, Asgharzadeh A and Chamani M. 2012. Effect of Azotobacter population on physico–chemical characteristics of some soil samples in Iran. Scholars Research Library Annals of Biological Research, 3(7):3120-3125.
Narula N, Kumar V, Singh B, Bhatia R and Lakshminarayana K. 2005. Impact of biofertilizers on grain yield in spring wheat under varying fertility conditions and wheat-cotton rotation. Archives of Agronomy and Soil Science, 51(1): 79 – 89.
Nourmohammadi G, Siyadat A and Kashani A, 2005 .A Kernel of Wheat. Publication of Shahid Chamran University of Ahvaz. Ahvaz. (In Persian).
Nourmohammadi G, Siyadat A and Kashani A. 2000 .A Kernel of Wheat. Poblication of Shahid Chamran University of Ahvaz. Ahvaz. (In Persian).
Ostadi Jaafari A, Rezvani Moghaddam P and Ghorbani R. 2012. Study of Beneficial Levels and Effect of Azotobacter spp. and Azospirillium spp.Iranian Journal of Field Crops Research, 10(2): 277-283 (In Persian).
Palleroni NJ. 1984. Gram negative aerobic rods and cocci. Pp. 140-199. In: Krieg, NR, (Eds.), Bergey’s Manual of Systematic Bacteriology. Williams and Wilkins, Baltimore.
Rahimi L, Aliasgharzad N and Oustan SH. 2012. Effect of Native Azotobacter chroococcum Strains on Growth and Uptake of Nitrogen and Phosphorus by Wheat Plant in Greenhouse Conditions. Journal of Water and soil Science, 15 (58) :159-171. (In Persian).
Reddy GSN, Prakash JSS, Matsumoto GI, Stackebrandt E and Shivaji S. (2002). Arthrobacter roseus sp. nov., a psychrophilic bacterium isolated from an Antarctic cyanobacterial mat sample. International Journal of Systematic and Evolutionary Microbiology, 52: 1017-1021.
Reed CS, Cleaveland CC and Towsend AR. 2011. Functional ecology of free livingnitrogen fixation: A contemporary perspective. Annual Reviewof Ecology and Systematics, 42:489-512.
Rios-Gonzalez K, Erdei L and Lips SH. 2002. The activity of antioxidant enzymes in maize andsunflower seedlings as affected by salinity and different nitrogen sources. Plant Science, 162: 923-930.
Rowell DL. 1994. Soil Science: Method and Application. Longman Scientific and Technical, Soil and Plant Analysis, Wageningen Agriculture University. The Netherland, P. 350.
Sadeghi S, Heidari GHR, Sohrabi Y.2015. Effect of Biological Fertilizer and Fertilization Management on Some Growth Indices of Two Maize Varieties. Agricultural and Sustainable Production Knowledge, 25(3): p 43-60. (In Persian).
Sarikhani MR and Moradi Sh. 2015. Review on the Researches of Biofertilizers in Iran. The eighth national conference on agriculture research findings. University of Kurdistan, Sanandaj. Iran. (In Persian).
Sayed AV, Hossein AF. 2011. Investigation of biofertilizersinfluence on quantity and quality characteristics in Nigella sativaL. Horticulture,. 3 (3): 88–92.
Shaharoona B, Arshad M, Zahir Z A and Khalid A. 2006. Performance ofPseudomonas spp. containing Acc-deaminase for improving growth and yield ofmaize (Zea mays L.) in the presence of nitrogenous fertilizer. Soil Biology andBiochemistry, 38: 2971-2975.
Suneja S, Narula N, Anand RC and Lakshminarayana K. 1996. Relationship of Azotobacter chroococcumsiderophores with nitrogen fixation. Folia Microbiology, 41: 154-158.
Violent HGM, and Portugal VO. 2007. Alternation of tomato fruit qualityby root inoculation with plant growth-promoting rhizobactria (PGPR): Bacillussubtilis BEB-13bs. Scientia Horticulture, 113: 103-106.
Waling I, Vark WV, Houba VJG and Van der lee JJ, 1989. Soil and Plant Analysis, a series of syllabi. Part 7. Plant Analysis Procedures. Wageningen Agriculture University, the Netherland.
Zahir AZ, Abbas SA, Khalid A, and Arshad M. 2000. Substrate depended microbial derived plant hormonesfor improving growth of maize seedling. Pakistan Journal of Biological Science, 3: 289-291.
Zaied KA, Abd-El-Hady AH, Sharief AE, Ashour EH and Nassef MA. 2007. Effect of horizontal DNA Transfer in Azospirillum and Azotobacter Strains on biological and biochemical traits of non-legume plants. Journal of Applied Sciences Research, 3(1): 73-86. | 
2
