• Meetprogramma 'kwaliteit bovenste grondwater landbouwbedrijven'; resultaten tweede bemonstering 1993

      Swinderen EC van; Fraters B; Vissenberg HA; Haan T de; Hoop DW de; het Landbouw Economisch Instituut van de Dienst Landbouwkundig Onderzoek (LEI-DLO), Den Haag; LBG (Rijksinstituut voor Volksgezondheid en Milieu RIVM, 1996-09-30)
      A three-year monitoring programme was started in 1992 to assess the quality of the upper groundwater in the sandy regions of the Netherlands due to fertilisers and manure in agriculture. This programme is a cooperative effort of the National Institute of Public Health and the Environment (RIVM) and the Agricultural Economics Research Institute (LEI-DLO). The report contains the monitoring results of the first two years of the programme. Furthermore, a multiple regression analysis was carried out using data from the LEI-DLO farm-accounting system. This was to find a relationship between farm management practice and groundwater quality. The upper 100 cm of groundwater occurring within five metres from the surface was sampled at 94 farms and analysed for chloride, nitrate, ammonium, potassium, dissolved organic carbon, phosphate (ortho and total) and the heavy metals cadmium, copper and zinc. The farms (75 cattle farms and 19 arable farms) are situated in the central, northern, eastern and southern sandy regions of the Netherlands.
    • Meetprogramma Kwaliteit Bovenste Grondwater Landbouwbedrijven; resultaten eerste bemonstering 1992

      Swinderen EC van; Willems WJ; Daatselaar CHG; Haan T de; Hoop DW de; Rijksinstituut voor Volksgezondheid en Milieuhygiene RIVM; Landbouw Economisch Instituut LEI-DLO; LBG; LEI-DLO (Rijksinstituut voor Volksgezondheid en Milieu RIVM, 1994-07-31)
      In 1992 a three-year monitoring program was started to assess the quality of the upper groundwater in the sandy regions of the Netherlands as a result of using fertilizers and manure in agriculture. This program is a cooperative effort of the National Institute of Public Health and Environmental Protection (RIVM) and Agricultural Economics Research Institute (LEI-DLO). From march to august 1992 the upper groundwater from 93 farms was sampled and analyzed for chloride, nitrate, potassium, dissolved organic carbon and phosphate (ortho and total). The report contains the monitoring results of the first year of the program. Mean nitrate and potassium concentrations exceed quality objectives, especially under grassland and silage maize on cattle farms. Nitrate and potassium concentrations in the groundwater of arable farms were generally lower than of cattle farms but on average above quality objectives. In the reports to follow a more detailed analyses will be carried out and the monitoring strategy will be evaluated with a view to the desirability of detecting trends in groundwater quality in future.
    • Verkennend onderzoek naar de kwaliteit van bodem en grondwater langs snelwegen in bosgebieden

      Groot MSM; Swinderen EC van (1993-12-31)
      Abstract niet beschikbaar