Controlled drainage isn’t just for flat fields anymore
Print
EmailNew research from Michigan State University shows controlled drainage can reduce nitrate loss even on sloped fields, challenging long-standing recommendations.
Controlled drainage has long been recommended for relatively flat fields, but new research from Michigan State University is challenging that recommendation. A recent paired-field study evaluated controlled drainage on a field where only 6.6% of the field was under water management and found a surprising 48% reduction in nitrate load.
How does controlled drainage work?
Controlled drainage uses a control structure with a weir to raise the outlet elevation of subsurface drainage systems. This allows farmers to manage water levels based on crop needs and seasonal conditions, while also reducing nutrient loss.
Key findings from the new research include:
- Why steep slopes shouldn't be ruled out for controlled drainage.
- The two functions of controlled drainage: crop yield focus and water quality focus.
- How controlled drainage reduces nitrate loss in steep fields.
- How controlled drainage retains water on flat fields to support growth across a larger area and reduces nitrate loss on both flat and steep fields.
Read more in “Controlled Drainage Beyond Flat Fields,” a new bulletin from Michigan State University Extension.
