Controlled Drainage Effectiveness in Reducing Nutrient Outflow in Light of Climate Changes

This modeling study focused on the hydrological and water quality effects of controlled drainage (CD) when operated using a subsurface system in an agricultural field Wielkopolska region. The DRAINMOD hydrologic model was well calibrated validated experimental field. used performance CD free (FD) combinations (108 27, respectively) near-future climate change scenario. objective to understand potential groundwater table (GWT), outflow, surface runoff, nitrogen phosphorus reduction under projected conditions Poland during 21st century with shared socioeconomic pathway SSP370. results indicated that earliest start practice is most effective increasing GWT. Compared current climatic conditions, applying 1 March near future, initial GWT 60 80 cm b.s.l. wet years, outflows will increase by 33% 80% for GFDL model, 30% 40% MPI 17% 23% UKESM model. Comparing runoff values obtained MPI, GFDL, models predict significant which due predicted precipitation. annual NO3–N 22, 19, 15 kg per hectare wet, normal, dry respectively, future. Among scenarios, higher PO4 leaching compared models.