A phosphorus Index for Norway
- 1 September 2005
- journal article
- research article
- Published by Informa UK Limited in Acta Agriculturae Scandinavica, Section B — Soil & Plant Science
- Vol. 55 (3), 205-213
- https://doi.org/10.1080/09064710510029088
Abstract
The phosphorus (P) Index, a risk assessment tool, is a simple approach used to rank the potential for P loss from agricultural fields. The P Index identifies areas where sources of P coincide with high risk of P transfer. Factors included in the P Index, developed for Pennsylvania, USA were justified in relation to Norwegian conditions and relevant changes were made. Phosphorus application rate was modified by crop P removal. Additional factors for: 1) P release by freezing of plant residues, 2) flooding frequency, 3) risk of leaching, and 4) annual precipitation were included. Management practices in the Index were adjusted to reflect the effect of time and method of P application on P loss, as well as erosion control measures relevant to agricultural management in Norway rather than Pennsylvania. Testing of the suggested P Index showed that it ranks the potential for P loss from several agricultural catchments in the south-eastern part of Norway relatively well (R 2=0.79). Continuous development of the Index to include new knowledge about processes for P loss as well as regional differences is of great importance for future use of the P Index.Keywords
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