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Description: Controlled drainage has been found to be a best management practice for decreasing drainage flows and thereby reduce the nutrient export from the field compared to free drainage. However, the ability of controlled drainage to reduce nutrient loading under different climate and soil conditions has not been thoroughly investigated. Year-round monitoring has also been a challenge, especially when trying to capture the significant contribution of the spring thaw event. The objective of this study was to conduct year-round measurements of nutrient loading and to compare the event-based nutrient export between controlled drainage and free drainage in a field site. Edge-of-field monitoring of the sites was done by measuring the flowrate at each of the control structures located at each drainage outlet for both field sites. The daily flow-weighted average of nutrient export was compared. Preliminary results show over 60% reduction of phosphorus exports in controlled drainage compared to free drainage.

Keywords: Controlled Drainage, Water Table Depth, Free Drainage, Phosphorus export
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Date: 2017-08-07
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Conference name: CSBE/SCGAB 2017 Annual Conference, Canad Inns Polo Park, Winnipeg, Manitoba, 6-10 August 2017.
Session name: Session 1B: Sustaining Water and Soil Quality

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Type: Text.Article
Format: PDF
Publication type: Technical conference
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Coverage: Canada
Language 1: en
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Rights: Canadian Society for Bioengineering
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