Nitrogen fixation is how nitrogen in the air (N2) is changed (converted) into ammonia () or other nitrogenous compounds in the soil.
n aɪ t ɹ ə d̠ʒ ə n WORD_BOUNDARY f ɪ k s eɪ ʃ ə n WORD_BOUNDARY ɪ z WORD_BOUNDARY h aʊ WORD_BOUNDARY n aɪ t ɹ ə d̠ʒ ə n WORD_BOUNDARY ɪ n ð ɪ WORD_BOUNDARY ɛ ɹ WORD_BOUNDARY ɛ n WORD_BOUNDARY t uː WORD_BOUNDARY ɪ z WORD_BOUNDARY t̠ʃ eɪ n d̠ʒ d WORD_BOUNDARY k ə n v ɜː t ɪ d WORD_BOUNDARY ɪ n t ʊ WORD_BOUNDARY æ m oʊ n iə WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY ʌ ð ə ɹ WORD_BOUNDARY n aɪ t ɹ ə d̠ʒ ə n ə s WORD_BOUNDARY k ɑ m p aʊ n d z WORD_BOUNDARY ɪ n ð ə WORD_BOUNDARY s ɔɪ l WORD_BOUNDARY