Gårdsjön Status Report for 1991-1992: The first Year of Treatment
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- NIVA-rapport 
Nitrogen addition weekly to catchment G2 at Gårdsjön began April 1991. During the first year of treatment a total of 230 meq/m²yr NH4No3 was added in 33 mm of water plus 90 meq/m²/yr deposited in 631 mm throughfall. Runoff contained significantly higher concentrations of No3 (but not NH4) beginning in November 1991. No respons was seen during the growing season. None of the other components and processes (soil solution, mineralization, fine-roots, mycorrhiza and vegetation) studied as part of NITREX showed significant response during the first year of treatment.