A large-scale research and development project has shown that giving farmers resources and advice on nitrogen fixation through legume plants can double yields and boost incomes in Africa. But not all farmers are benefiting from this practice due to a lack of access to inputs, such as fertilizers says Ken Giller, the leader of the N2Africa project, as a second phase to widen access to the initiative is announced with US$25.3 million funding from the Bill & Melinda Gates Foundation for the next five years.