• Ionic equilibrium in nitrogen fixation systems: Consultant final report IICA/EMBRAPA-PROCENSUL II 

      Instituto Interamericano de Cooperación para la Agricultura (IICA); Empresa Brasileña de Investigación Agropecuaria (EMBRAPA); Raven, John Albert (IICA, 1989)
      The paper refers to the cooperation IICA/EMBRAPA on research on soil management and soil analysis, especially, ionic equilibrium in nitrogen fixation systems.
    • Simposio Internacional de Fixação de Nitrogênio das nâo leguminosas 

      Instituto Interamericano de Cooperación para la Agricultura (IICA); Empresa Brasileña de Investigación Agropecuaria (EMBRAPA); Rodríguez Barrueco, Claudino; Zuberer, David A.; Skinner, Frederick; Yacob, Okon (IICA, 1989)
      Topics covered in the symposium: the occurrence of N-fixing symbionts in the root nodules of non-legumes, such as the Frankia-Alnus and Rhizobium-Parasponia symbioses, and the mechanims of infection of higher plants by ...