Assessing Nitrogen Contribution and Rhizobia Diversity Associated with Winter Legume Cover Crops in Organic Systems Webinar

Watch the webinar on YouTube at

Resources and notes from the webinar:

Clovers were planted at a density of 22.4 kg ha-1, vetches at 28 kg ha-1, winter peas at 67.2 kg ha-1, lupin at 134 kg ha-1. Bicultures MXE and MXM consisted of 28 and 56 kg ha-1 hairy vetch and rye respectively, and 50.4 and 56 kg ha-1 Austrian winter pea and rye respectively for MXP.

About the Webinar:
This webinar is designed to deepen your understanding of how legume cover crops, through a symbiotic relationship with beneficial soil rhizobia bacteria, can be used to provide new nitrogen to your organic crops through the process of nitrogen fixation. We will review the process of nitrogen fixation, and provide recent data from our lab describing the amount of nitrogen fixed by common and some novel cover crop legumes used in organic agriculture. We will also briefly discuss how the diversity of rhizobia present in the soil may impact this process.

Find all eOrganic upcoming and archived webinars »

About the Presenter:
Julie Grossman is an Assistant Professor in the Department of Soil Science at North Carolina State University specializing in organic cropping systems. Most recently, Julie began leading a new project integrating community gardens in low-income Raleigh neighborhoods with undergraduate soil science and nutrition courses. She also serves on the Steering Council of the Sustainable Agriculture Education Association,  a new professional association championing innovative educational approaches for sustainable agriculture.

About eOrganic

eOrganic is the Organic Agriculture Community of Practice at Our website contains articles, videos, and webinars for farmers, ranchers, agricultural professionals, certifiers, researchers and educators seeking reliable information on organic agriculture, published research results, farmer experiences, and certification. The content is collaboratively authored and reviewed by our community of University researchers and Extension personnel, agricultural professionals, farmers, and certifiers with experience and expertise in organic agriculture.


Published November 18, 2010

This is an eOrganic article and was reviewed for compliance with National Organic Program regulations by members of the eOrganic community. Always check with your organic certification agency before adopting new practices or using new materials. For more information, refer to eOrganic's articles on organic certification.