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Finn Plauborg

Effects of poorly and well drained conditions on the fate of nitrogen in an agricultural tile drained calcareous clay field.

Research output: Contribution to conferenceConference abstract for conferenceResearch

A long term experiment has been set up on a field at Tokkerup, which is located on South Zealand, Denmark, in order to understand the water flow dynamics and fate of nitrogen in the matrix, drainage and groundwater flow. The field is 3.8 ha, relatively flat, with macroporous clayey and calcareous subsoil (JB7, JB12 by the Danish soil classification.). The field has been separated to poorly drained (North) and well-drained (South) area, due to the high groundwater table in the poorly drained part. Downstream in a well at the poorly drained and the well-drained part an automatic magnetometer to measure drainage water flow and an automated water sampler have been deployed to separate the water flow and chemical characteristics of the water from the two part of the field. The experiment aims at finding how the fate of nitrogen differs in the two parts of the field. According to Hansen and Jensen (2013) plot 6 in Northern part has lower crop yield, than in the Southern part of the field with equal N fertilizer input. It is suggested that the excess nitrogen either bypasses the matrix through preferential flow based on Holbak (2017), or leaving the system through denitrification, due to the generally higher groundwater table. In order to identify the responsible processes for the nitrogen loss, plot 2 (South) and 6 (North), which are located between two side drains, have been selected for further studies. For each plot/location TDR probes and Redox probes have been installed at three different depths at 0.3, 0.6 and 0.9 meters, perpendicular to the side drains at distances 0.5, 4.25 and 8 m. Six piezometer tubes were placed at only two depths of 0.6 and 0.9 m, but at the same distances.
Original languageEnglish
Publication year9 Jan 2019
Publication statusPublished - 9 Jan 2019
Event2018 - 2019 SSSA International Soils Meeting : SOILS ACROSS LATITUDES - Sheraton San Diego Hotel & Marina, San Diego, United States
Duration: 6 Jan 20199 Jan 2019


Conference2018 - 2019 SSSA International Soils Meeting
Location Sheraton San Diego Hotel & Marina
CountryUnited States
CitySan Diego
Internet address

    Research areas

  • Nitrate leaching, Drainage, field experiment

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