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Plants can utilize soil nitrogen (N) as ammonium-N (NH 4 + -N) or nitrate-N (NO 3 -N). Ammonium nitrate, an inorganic N fertilizer, having both forms of N, when added to the soil, causes an immediate change in the soil N dynamics. The ratio of ammonium to nitrate keeps changing and influences the soil pH and thus the rhizosphere environment sometimes making it toxic. To investigate the genotoxicity of ammonium nitrate fertilizer; Allium cepa L. was used as a model plant. A pot experiment wasdoi:10.1097/00010694-195706000-00009 fatcat:vqf33esruff43ildfb34mm7ux4