Nitrogen fixation in perspective: an overview of research and extension needs.

摘要: Abstract Recent reports point to a decline in agricultural dependence on symbiotic nitrogen (N 2 ) fixation, and the use of rhizobial inoculants. This review contrasts potential contribution biologically fixed N intensive extensive systems, examines opportunities for continued major contributions latter. It identifies six research extension areas which in-depth efforts are still needed, some improved fixation likely arise through advances molecular biology.