Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2014
Authors
Paal KrokeneAbstract
No abstract has been registered
Authors
Paal KrokeneAbstract
No abstract has been registered
Authors
Kristian Hassel Leif Appelgren Hans Blom Kirstin M. Flynn Geir Gaarder Einar Heegaard Torbjørn Høitomt John Bjarne Jordal Maria Thorkildsen Lars Söderström Kristin WangenAbstract
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Authors
J E Munyaneza V G Sengoda Leif Sundheim Richard MeadowAbstract
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Aytac ErdemirAbstract
No abstract has been registered
Authors
Aytac ErdemirAbstract
No abstract has been registered
Authors
Samuli Launiainen Martyn N. Futter David Ellison Nicholas Clarke Leena Finér Lars Högbom Ari Laurén Eva RingAbstract
No abstract has been registered
2013
Abstract
Nitrogen (N) efficiency on farm gate is studied for the year 2010 on ten Norwegian, organic dairy farms and ten conventional as references. Preliminary results are presented here, and the method is discussed. N-efficiency is calculated as Net N-Export (kg) / Net N-Import (kg). Nitrogen from biological N-fixation had a large impact on calculated N-efficiency. Because of large annual variations and uncertain estimates of amount of N from biological N-fixation caused by uncertainties in roughage yields, clover content and the amount of nitrogen fixed per kg clover harvested, the numeric values of estimated N-efficiency should not be taken as exact values. N-efficiency is estimated with and without biological N fixation. There are large variations in farm size, use of concentrates and milk yield per cow within the group of organic farms. However, the variation is even larger within the conventional farms. On average, the estimated N-efficiency was higher on the organic than on the conventional farms. However, there are large variations in estimated N-efficiency within the organic as well as the conventional group. This gives us the possibility to identify on which farms actions should be taken to improve N-efficiency.