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   ocr: nitrogen in atmosphere. plant protein - - lightning - - XS - - - - - - - - - fixation plant animal protein proteina - - - - - - - * - - - 5 - - de- 17 nitrifying - - - 1 - - - - - A bacteria - rm nitrogen- excretion, fixing de- bacteria composition excretion, In roots death nitrogen- ands soil nitrates fixing marne blue/green acids amino nitrites sediment algae