Nitrogen is one of the most important major limiting nutrients for most crops and other plant species. Nitrogen fertilizers affect the balance of the global nitrogen cycle, pollute groundwater and increase atmospheric nitrous oxide (N2O), a potent "greenhouse" gas. The production of nitrogen fertilizer by industrial nitrogen fixation not only depletes our finite reserves of fossil fuels but also generates large quantities of carbon dioxide, contributing to global warming | Plant genetic control of nodulation and its utilization in nitrogen fixation - A review
