home    about    browse    search    latest    help 
Login | Create Account

Evaluation of nitrogen utilizsation by means of the concept of primary production balance

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.

[img] RTF (Rich Text Format)
21Kb

Summary

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
Related Links:http://tripunix.mtt.fi/cgi-bin/thw/?%24%7BBASE%7D=arktui&%24%7BHTML%7D=poimvapdocu_eng&%24%7BOOHTML%7D=docu_eng&%24%7BSNHTML%7D=nosyn_eng&%24%7BANDOR%7D=or&%24%7BTRIPSHOW%7D=format%3Dwww_eng&NR=+310-08
Deposited By: Koistinen, Riitta
ID Code:5940
Deposited On:28 Sep 2005
Last Modified:12 Apr 2010 07:31
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

Repository Staff Only: item control page