Developments In The Nitrogen Surplus And The Fossil Energy Use In
Danish Agriculture During The 20th Century
Author(s)
T. Dalgaard & A. Kyllingsbæk
Abstract
Developments in the nitrogen surplus and the
fossil energy use in Danish agriculture during
the 20" century
T. Dalgaard & A. Kyllingsbak
Danish Institute of Agricultural Sciences, Denmark
Abstract
This paper goes through the development in nitrogen imports, nitrogen exports,
nitrogen surplus, and fossil energy use in Danish agriculture during the 20th
century. The nitrogen export in the form of animal and vegetable products rose
throughout the century. Until around 1950, atmospheric N derived by leguminous
crops was the dominant nitrogen import, but then N fertilisers became dominant.
Since 1983, the fertiliser import and the nitrogen surplus have dropped, and
nitrogen imported in the form of concentrate fodders now equals the amount
imported in the form of fertilisers. The fossil energy use generally follows the
fertiliser use and, like the nitrogen surplus, has been in a continuous decline since
the mid-eighties after an almost exponential growth period from 1945-1970.
On the basis of the ni
Keywords
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