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Experimental studies of nitrogen fertilizers emissions from the catchment area
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 15th International Conference Monitoring of Geological Processes and Ecological Condition of the Environment, Nov 2021, Volume 2021, p.1 - 5
Abstract
The intensification of agriculture is closely related to the use of fertilizers, which has led to a significant increase in the pollution of waters. Globally, the share of diffuse water pollution has exceeded the role of point sources. Experimental studies on small plots were conducted to assess the impact of fertilizers on the nitrogen leaching from the catchment area during snowmelt event. Ammonium nitrate in dose of 300 kg per ha was applied to one of the plots. 18.6% of nitrogen compounds were additionally leached from the fertilized plot compare to the control one. In the undisturbed conditions the nitrogen emission is equally provided by surface flow and a subsurface flow, whereas upon applying fertilizers it is almost completely determined by a subsurface flow -97%. Obtained data showed that 96% of N water emission within agricultural area are provided by fertilizers. Due to good solubility the nitrate leaching from catchment was significantly higher in comparison with the ammonium form. The part of NO3- compounds in a surface flow was 42% in natural conditions and 2% on the fertilized plot. It was 58% and 98% correspondingly in a subsurface flow. Fertilizer application did not increase ammonium outcome from the catchment.