Nitrogen fertilization in organic crop rotations

Nitrogen dynamics in organic farming systems with vegetables is studied on organic soils at Landvik in Grimstad. Focus has been to study the productivity of nitrogen fixating crops, nitrogen available to following crops, use of catch crops to reduce leaching. Studies have been performed on different rotations including the main crops: onion, carrots, lettuce, potatoes, head cabbage, broccoli, fava beans and peas and green manure crops of clover crops.

Research has been focused also on co-streams from agricultural farming or food industry to be used as fertilizers. Our research within this topic has be related to utilization of anaerobic digested food waste,  shrimp shell and macro algae meal in comparison with animal manure and mineral fertilizers.