There was a negative correlation between the nitrogenase activities of nitrogen fixing bacteria in root and that in leaf and stem.

此外，甘蔗根、茎、叶中固氮菌的固氮酶活性之间关系较为密切，根中固氮菌的固氮酶活性与叶片和茎中的都呈负相关。

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In the nitrogen-free Pot experiment, the nodulating competitive ability of the parental and marked strains and their nitrogen fixing efficiency were tested.

通过砂培试验研究了标记基因对受体菌株的竞争结瘤能力和固氮有效性的影响。

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Nitrogen for plant nutrition is mainly obtained from three sources: nitrogen-fixing plant, rain water and manure.

氮素是植物必要的营养元素之一，其主要来源有：生物固氮作用、降雨和灌溉水以及人工施肥。

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He acknowledged that any soil used to grow nitrogen-fixing plants or were fertilised for agricultural reasons would result in an increase in gases involved in the formation of ozone.

BBC: Invasive plant 'increases ozone pollution'

Fossil fuel burning and fertiliser manufacture now take more nitrogen from the atmosphere than all of the planet's nitrogen-fixing microbes - and there are a lot of those bugs out there.

BBC: Leaving our mark: Fossils of the future