AGWAPLAN Side 1 · · Lake Ravn catchment Irene Paulsen, Skanderborg municipality and Kjartan Einarson, agricultural advisor

AGWAPLAN Lake Ravn Catchment Total area 5500 ha, approx ha farmland Project area marked with red Side 2 · · Farmland in the projectarea app. 520 ha ~ ¼ of the total farmland in the catchment

AGWAPLAN The goal for Lake Ravn : Average load of 1700 kg P/year The modeling indicated a need for a 50 % reduction of the average phosphorus load during the years in which the modeling was done to reach ”good ecological status”. Goal : 50 % of 1700 kg/year = 850 kg P/year max : Average load approx kg P/year 300 kg P reduced by better waste water purification 150 kg P/year to be reduced from the farmland Side 3 · ·

AGWAPLAN Side 4 · · Goal for Lake Ravn Present P-load 1300 Average total load -300 B etter purification af wastewater -600 Esitmated natural load/farmland -200 from either natural or farmland 150 Surplus = loss from farmland

AGWAPLAN Integrated advisory service before visiting the farmer  Enviromental accounting (N and P account)  DIS – map  GAP – Good Agricultural Practice Manual a, list of possible methods to reduce P-surplus  Results of soil-mapping  P-index Side 5 · ·

AGWAPLAN Soiltype mapping Eksempel på kort Side 6 · ·

AGWAPLAN Side 7 · · P-index map Bek Low index High index Medium index

AGWAPLAN Integrated advisory service when visiting the farmer  Pin-point risk-areas (steep fields, streams close to the fields, use of the fields; history and now)  Analyse methods in the GAP-manual – what could be used on this farm Side 8 · ·

AGWAPLAN Side 9 · · Summary of integrated advisory visits The reduction in potential loss of phosphorus, achieved/obtained at the integrated advisory visits was not enough to fulfill the goal in the catchment area. Achieved in the short term: 3 kg P/year in the project area (*4=12) Achieved in the long term: 17 kg P/year in the project area (*4 =68) Goal: 150 kg P/year can not be reached, even on the long term

AGWAPLAN Side 10 · · Catchment - solution The idea: Water from streams in the catchment run through a lake, where phosphorus can settle, before continuing to Lake Ravn. To day: The area is flooded in the wintertime, animals feed on the grass in the summertime The are some valuable meadows in the area

AGWAPLAN Catchment - solution

AGWAPLAN Catchment - solution Problems in the catchment solution:  More than one owner, with different interests  Other than the owners gain from the effect – compensation ?  Part of the potential lake-area is used in agricultural farming  Part of the meadow-area is home for rare plant-species Side 12 · ·

AGWAPLAN Side 13 · · Alternative to catchment solution Small sedimentation basins, in connection with drainages from fields with high P-index, before outlet to the stream. Experiment will be established in the spring 2009 and the first results in the spring This solution is easier, because it only involves one landowner.