2026-06-27http://hdl.handle.net/123456789/120946This book is the proceedings of a symposium held at the International Institute of Tropical Agriculture, Ibadan, Nigeria in Oct. 1975. It is divided into sections on general considerations (3 papers); legumes in farming systems of the tropics (4 papers); ecology and physiology of rhizobia (6 papers); nitrogen fixation in legumes (7 papers); non-legume sources of biological N in nature (6 papers); and measuring N gains and losses in farming systems (4 papers). The following are noted.application/pdfLimited Accessnitrogen fixationfarming systemstropicssoilConference Proceedings