【摘要】 生物固氮是土壤中氮素的主要来源。本文概述了生物固氮的定义 研究的进展及生物固氮技术的应用，并对生物固氮研究的前景进行了展望。更多还原

【Abstract】 Biololgical nitrogen - fixing is the main source of nitrogen in soil. The essay briefly gives the definition of biololgical N - fixing express, the development of the research on biological N - fixing and the status of applyig biological nitrogen fixation technology. It also suggests the perspectives of the application of biological N - fixing technology.更多还原