Observationsfält på åkermark : Avrinning och växtnäringsförluster för det agrohydrologiska året 2007/08 samt en långtidsöversikt

• The objective of the programme "Observation fields on arable land" is to monitor the influence of agricultural cultivation on the quality of surface water and groundwater within selected fields. At present it consists of thirteen fields. These have measuring devices for registration of discharge and are parts of the farmer’s regular operations. The fields (4-34 ha) cover various soil types, and cropping and fertiliser regimes.In the agro-hydrological year 2007/08 eight fields had higher and five fields had lower precipitation compared to normal. Three fields had much higher discharge (157-163 %) compared to the long-term value. The concentrations of the major ions in the drainage and groundwater were in general representative in relation to the long-term values for all fields.The leaching of nitrogen and phosphorus were in general with some exceptions also representative in relation to actual cropping sequence and hydrological conditions. However at one field the leaching of nitrogen was much higher than the long-term value. The main reasons seem to be high mineral nitrogen level in the soil profile after ploughing of ley (March-07) followed by substantial summer discharge (June-July).Nitrate nitrogen in groundwater was at all sites lower than the limit value for the nitrate directive.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)

Nyckelord

Jordbruksmark

Agriculture

Observationsfält på åkermarkmark

Observationsfält på åkermarkmark

Zero Eutrophication

Ingen övergödning

Nationellt finansierad miljöövervakning

National

Publikations- och innehållstyp

vet (ämneskategori)

rap (ämneskategori)