Since 1992, manure application on cropland has been made on a farm of a swine farrow-to-finish production unit of 200 sow. Monitoring of the surface and groundwater has been made and the results show that most of the nutrient losses occurred as tile flow. Concentration of nutrients have been measured and the average of nitrate-N levels were slightly above the health recommended concentration, 13,8 mg/L compared to 10mg/L. Leaching from commercially fertilized crop ground are generally slightly higher than the value found. The phosphorus concentration averaged 0,6 mg/L. The nutrient losses from runoff was not significant as very little occurred. Testing on groundwater was also done. The results show that higher nitrate concentrations could be measured the years after fall application had been done and when the overapplying manure. The average concentration in ground water for the 3 rates and the two years samples is 13,6 mg/L.

The application rates of nutrients from manure were: for 1992, 157 kg/ha of N and 48 kg/ha P; for 1993, 215 kg/ha of N and 137 kg/ha of P and finally for 1994, 198 kg/ha and 122kg/ha de P. The manure treatments on the plots consisted of no manure, the application rates presented, 2 times the application rates and the final one was 3 times the application rates.