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1·Nodule bacteria are very good at biological nitrogen fixation.

根瘤菌是生物固氮的能手。

2·Nitrogen fixed by legume root nodules accounts for 40% of total biological nitrogen fixation.

豆科植物的根瘤固氮占生物固氮总量的40%。

3·In order to simulated biological nitrogen fixation, a series of studies on nitrogenase are proceeded.

为了模拟生物固氮，对固氮酶进行了一系列的研究。

4·Nitrogen fixation trees of Leguminosae and non-Leguminosae are important biological nitrogen fixation resources.

豆科及非豆科固氮树种是重要的生物固n资源。

5·Early study object of the biological nitrogen fixation bacterium is the Rhizobium which related to the nitrogen fixation of the Leguminosae.

其中研究的较早的生物固氮菌是与豆科植物共生固氮的根瘤菌。

6·Biological nitrogen fixation (BNF), which provides all the plants on the globe with 75% of fixed nitrogen, is one of the important projects in life science.

生物固氮为全球的植物提供75%的氮素，是生命科学中的重大课题。

7·It is important to quantitatively characterize biological nitrogen fixation (BNF) of soybean for farmland fertilizer management and non-point source pollution control.

定量描述大豆生物固氮量对于施肥管理以及农业非点源污染控制具有十分重要的意义。