Managing nitrogen inputs into seagrass meadows near a coastal city: Flow-on from research to environmental improvement plans

► Adelaide coastal zone received 2453 tN yr−1 of nitrogen between 2001 and 2003. ► Nutrients have been attributed to historical seagrass losses of over 5000 ha. ► Seasonal nitrogen uptake rates by seagrasses and epiphytes were modelled. ► Only 31% of ammonium and <1% of nitrate currently discharged was taken up. ► Environment Improvement Programs to achieve targeted reduction to 700 tN yr−1.