Fertilization of crops using nitrogen fertilizers has dramatically improved the yield of food per acre around the world. However, the law of unintended consequences also results in pollution like oxides of nitrogen in the air and soil. Scientists have known that certain varieties of crops such as legumes have the natural capacity to fix atmospheric nitrogen for use. The cause has been recently discovered to be bacteria that live on the plants. It raised the interesting prospect that if the same capacity can be built into other plants then the need for the artificial nitrogen fertilizers and its associated problems can be done away with. The research team in Cambridge has found that nitrogen fixing bacteria can be made to reside in other food plants. It is a finding that can have a profound impact and truly greener food production.
http://cleantechnica.com/2013/08/03/crops-nitrogen-fixing-from-air/
