Sytnikov, Denys M.Ситніков, Денис МихайловичСытников, Денис Михайлович2017-12-222017-12-222013A Comprehensive Survey of International Soybean Research – Genetics, Physiology, 1. Agronomy and Nitrogen Relationships / Edited by James E. Board. – Rijeka (Croatia): InTech, 2013.https://dspace.onu.edu.ua/handle/123456789/12244Fixation of molecular nitrogen is one of the processes determining the biological productivity of our planet, which is why its study is one of the primary tasks of modern biology. The nitrogen cycle in nature is one of the key components of biogeochemical cycles of the Earth. The atmosphere consists of almost 80% (by volume) of the chemical element and is its main source. Nitrogen makes up a part of proteins and other molecules that form the basis of the structural organization of all levels of life. Humans and animals need it in the form of animal and vegetable protein. Plants need it in the form of salts of nitric acid and ammonium ions.enSoybean- RhizobialproductivityNitrogensalts of nitric acidBook chapter