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Affluent use of herbicide such as Atrazine especially in corn farms must be supplemented with water and soil resources. This research was conducted in a pilot farm of Chamran University, Faculty of Water Science Engineering, Ahvaz, Iran. This research investigated transmission of the dynamic use of atrazine in various depths of soil in growth period and after growth period. Also, atrazine transmission potentiality and existence from root zone and leaching estimation and chemistry model-pesticide (LEACHP) model of simulating atrazine concentration was evaluated. This research was performed in the form of full stochastically factorial form with three repetitions. So, in the time periods of 30, 60 and 175 days, the remaining atrazine was measured by high-performance liquid chromatography (HPLC) method  using soil samples (from depths of 0 to 125 cm in 25 cm layers in four times). Results showed that atrazine concentration in soil decreased with time lapse. For comparison of the observed and predicted data by LEACHP model, ME, MEF, EMSE and CRM statistical index were used. All the data obtained at the end of season for the different statistical index were 2.8, 0.96, 1.4 and 0.66 respectively, and a different depth of soil was obtained for level 2 irrigation. The simulation results show relatively good fitness with the observed data, as such, the LEACHP model could be used for simulation of atrazine movement and its dynamic transmission in soil for farm management.       Key words: Atrazine, high-performance liquid chromatography (HPLC), leaching estimation and chemistry model-pesticide (LEACHP) model, herbicide.

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Atrazine transport and distribution in field soils and comparison of the predictions made by leaching estimation and chemistry model-pesticide (LEACHP) model