نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
Increasing population and demand require increasing production per unit area. Competition for increased yield has led to excessive use of chemical fertilizers. Excessive use of chemical fertilizers and discharge of agricultural land drainage containing these compounds leads to pollution of water resources. Therefore, in the present study, the effect of different fertilization strategies on the amount of nitrate output in the irrigation and drainage network of the Dez River was investigated using the SWAT model. The calibration and validation of the model to simulate the amount of nitrate was carried out using statistical data from 1995 to 2017 at the network outlet (Bamdej station). To achieve the objectives of the present study, information related to the agricultural management of the region, including cropping pattern and planting and harvesting dates, irrigation rate and time, and fertilization rate, were entered into the model based on the information received for the study basin level. In order to evaluate the effect of fertilization rate on surface water quality, scenarios for reducing fertilization rate were introduced into the model. The results of model evaluation using R2 and NSE coefficients indicate the appropriate performance of the model in simulating the mentioned parameters. The results of applying fertilizer reduction scenarios showed that by applying 10, 20, 30, 40, 50, 60 and 70 percent reduction in fertilizer, nitrate was reduced by 2.74, 9.31, 11.25, 14.83, 17.95, 21.23 and 26.62, respectively. According to the findings of this study, it can be said that due to the high impact of fertilization, by controlling the amount of fertilizer used, pollution of surface water resources can be controlled to a large extent
کلیدواژهها English
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