New FertilCrop Technical Note: Examining root nodule activity on legumes


The symbiotic partnership between bacteria and legumes is vital for the supply of biologically fixed nitrogen to soil and plants in organic cropping systems. Perennial clovers in a dense grass clover ley may contribute more than 200 kg nitrogen (N) per ha and year to the cropping system from the second year after sowing.

This technical note aims at encouraging farmers to take a closer look at the roots of legumes and become more familiar with the process of nitrogen fixation and its relevance for organic farming. The note provides some key information on biological nitrogen fixation and describes a simple method for examining nitrogen-fixing root nodules.

The technical note can be downloaded from Organic Eprints.

Further information


About FertilCrop

Fertility Building Management Measures in Organic Crop-ping Systems – FertilCrop is a project funded CORE Organic Plus Funding Bodies, being partners of the FP7 ERA-Net project CORE Organic Plus. The overall aim of FertilCrop is to develop efficient and sustainable management techniques aimed at increasing crop productivity in organic farming systems. More information about FertilCrop is available at

Download Examining root nodule activity on legumes


Pommeresche, Reidun and Hansen, Sissel (2017) Examining root nodule activity on legumes. Technical Note. Research Institut of Organic Agriculture (FiBL), CH-Frick and Norwegian Centre for Organic Agriculture (NORSØK), NO-Tingvoll.

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