Nitrogen fixation: from molecules to crop productivity : proceedings of the 12th International Congress on Nitrogen Fixation, Foz do Iguaçu, Paraná, Brazil, September 12-27, 1999
Nitrogen fixation: from molecules to crop productivity : proceedings of the 12th International Congress on Nitrogen Fixation, Foz do Iguaçu, Paraná, Brazil, September 12-27, 1999