Work methods in JOVA

In 9 of the catchments (4 to 680 ha) farm data are collected from the farmers themselves, as they report all activities on their various fields throughout the year. This includes the smaller catchments. Information on farming in the four largest catchments (20-330 km2), ​​is obtained from Statistics Norway.

Nybygd V-overløp i Kolstadbekken 2012-EN
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Laboratory analysis

The standard laboratory analysis to assess nutrient loss and soil erosion includes pH, suspended solids (SS), total phosphorus (TP), dissolved phosphate (PO4-P), total nitrogen (TN) and nitrate (NO3). The analytical methods used to assess pesticide loss include GC Multi-M60, GC/MS Multi-M15 and LC-MS/MS Multi M91 (from 2011), and cover a total of 112 pesticide active ingredients and primary metabolites.

Precipitation and temperature - climate data

Rainfall and temperature are measured in some of the locations. For other catchments climate data are obtained from the nearest station of the Agricultural Meteorological Service (LMT) and The Norwegian Meteorological Institute.