NITRATE LEACHING DEPENDING ON CROPPING SYSTEMS

The soil content of mineral nitrogen to 1 m depth has been measured se veral times in the leaching period on 600 conventional agricultural fi elds in a SQUARE GRID with a side length of 7 km. The measurements wer e also carried out in 26 ecological fields. Information on management practice was collected every year and soil physical parameters were de termined. The soil content of mineral nitrogen in autumn was compared. Furthermore the nitrate leaching values were calculated in most of th e conventional fields and in nine of the ecological fields by means of the DAISY nitrogen model.