Seuri, Pentti and Kahiluoto, Helena (2005) Evaluation of nitrogen utilizsation by means of the concept of primary production balance. Paper at: Researching sustainable systems : first scientific conference of the International Society of Organic Agriculture Research (ISOFAR), held in cooperation with IFOAM and NASAA, Adelaide, South Australia, 21-23 September 2005.
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Primary production balance (PPB) indicates the ratio (*) between harvested nutrients and nutrients put into crop production from outside the system (=primary nutrients). The PPB is independent of the final output (crop vs. animal products) and can be used to evaluate different systems (farms). The utilization of nitrogen(N) was evaluated by means of the PPB on nine organic farms, stockless and mixed ones, in eastern Finland.
The mixed farms were able to reach a remarkably higher primary production balance (1.0 – 1.2) compared with the stockless ones (0.5). Values higher than 1.0 indicate recirculation of nutrients. Other components of the high PPB were legumes as nitrogen source and optimum livestock density.
|EPrint Type:||Conference paper, poster, etc.|
|Type of presentation:||Paper|
|Keywords:||nitrogen utilization, nutrient balance, nutrient loading|
|Subjects:||Environmental aspects > Air and water emissions|
|Research affiliation:||Finland > MTT Agrifood Research > Ecological Production|
|Deposited By:||Koistinen, Riitta|
|Deposited On:||28 Sep 2005|
|Last Modified:||12 Apr 2010 07:31|
|Refereed:||Peer-reviewed and accepted|
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