Management of Biological Nitrogen Fixation for the Development of More Productive and Sustainable Agricultural Systems: Extended versions of papers presented at the Symposium on Biological Nitrogen Fixation for Sustainable Agriculture at the 15th Congress of Soil Science, Acapulco, Mexico, 1994

Nitrogen Fixation with Non-Legumes: Proceedings of the 7th International Symposium on Nitrogen Fixation with Non-Legumes, held 16–21 October 1996 in Faisalabad, Pakistan

Biological Nitrogen Fixation for Sustainable Agriculture: Extended versions of papers presented in the Symposium, Role of Biological Nitrogen Fixation in Sustainable Agriculture at the 13th Congress of Soil Science, Kyoto, Japan, 1990