1- Abd El-Lattief, E. A. (2014). Effect of integrated use of Farm Yard Manure (FYM) and chemical fertilizers (NPK) on productivity of bread wheat under arid conditions. International Journal of Advanced Research, 3(12): 2278-6252.
2- Akram, A. H., and Ahmed, T. I.2017. Effect of humic acid on the kinetics of phosphorus of triple super phosphate fertilizer and growth and yield of corn Zea mays L. Anbar Journal of Agricultural Sciences, 15(2):347-359.
3- Ali, N. S., and N. H. Majeed. (2016). Rhizosphere Microorganisms and phosphorus availability for plants. The Iraqi Journal of Agricultural Sciences, 47(2): 635-645.
4- Ali, N. S., H. S. Rahi, and A. A. Shaker. (2014). Soil fertility. Scientific books house for printing and publishing. College of agriculture. Baghdad University.
5- Ansary, M. H., H. A. Rahmani, M. R. Ardakani, F. Paknejad, D. Habibi, and S. Mafakheri. (2012). Effect of Pseudomonas fluorescent on proline and phytohormonal status of maize (Zea mays L.) under water deficit stress. Annals of Biological Researoh, 3(2):1054-1062.
6- Celik, H., K. A. Vahap, A. B. Bulent, and M. A. Turan. (2011). Effect of foliar-applied humic acid to dry weight and mineral nutrient uptake of maize under calcareous soil conditions. Communications in Soil Science and Plant Analysis, 42(1): 29-38.
7- Elsahookie, M. M. (1990). Maize, its production and improvement. Baghdad University Press. Ministry of Higher Education and Scientific Research. Iraq.
8- Metin, T. A., G. b. Medine, C. C. Ramazan, O. F. Taskin, and D. Sahin. (2010). The effect of PGPR strain on wheat yield and quality parameters. Proceeding of World Congress of Soil Sci. Soil Solution for Changing World. August, 1-6.
9- Rahman, K. M., and Debnath, S. C. (2015). Agrochemical use, environmental and health hazards in Bangladesh. International Research Journal of Interdisciplinary and Multidisciplinary Studies, 1(6): 75-79.
10- Sarhan, T. Z., and K. Omar. (2010). The effect of inoculation with Azotobacter bacteria and different levels of nitrogen fertilizer on 1- vegetative growth of potato plant (Solanum tuberosum L.). Mesopotamia Journal of Agriculture. 38 (1 Appendix).
11- Sellamuthu, G., S. Soundarapandian, and C. P. Jasdeep. (2017). Azotobacter chroococcum: Utilization and potential use for agricultural crop production: An overview. International Journal of Advanced Research in Biological Sciences, 4(3): 35-42.
12- Vessey, J. K. (2003). Plant growth promoting rizobacteria as biofertilizers. Plant and Soil Journal, 255(34).
13- Wu, S. C., Z. H. Cao, Z. G. Li, K. C. cheung, and M. H. Wong. (2005). Effect of biofertilizer containing N. fixer, P and k solubilizers and AM fungi on Maize growth: a greenhouse trial. Geoderma journal, 125(1- 2): 155 -166.
14- Yasar, K., H. Unlu, and H. Padem. (2009). The influence of foliar and soil fertilization of humic acid on yield and quality of pepper. Acta Agriculturae Scandinavica, Soil and Plant Science, 59(3):233-237.