This is the final volume in a comprehensive seven volume series on all aspects of nitrogen fixation, one of the key biological processes on the planet and still a major provider of nitrogen in agro-ecosystems. The best known, and possibly most important, relationship in nitrogen fixation, that between root-nodule bacteria and legumes, is comprehensively examined in 12 chapters written by a wide range of experts in the field, and edited by an illustrious quartet.

A wide range of topics is covered in great depth and presented in an easy to read style, with good clear diagrams and figures. Topics described include the genetics of both bacteria and plant, the cellular biology of both infection and nodule development and the biochemical processes used by the symbiotic bacteroid to attain nitrogen fixation; whilst solving the logistic conundrum of providing enough oxygen for energy without inactivating the oxygen-sensitive nitrogenase enzyme. Basic physiology and the nitrogen forms involved are also explained, together with descriptions of the successful exploitation of this phenomenon in agriculture, horticulture and forestry.

The final chapter discusses the prospects and potential for future development in the exploitation of legumes, based on the present very significant role of nitrogen fixation in global agricultural production.

This is a well-written comprehensive text, with extensive bibliographies, that will be useful to students and academics at all levels, and is to be recommended strongly.