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。
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。
Human activities such as fossil fuel combustion, nitrogen fertilizer production and cultivation of nitrogen fixing crops are the main sources of reactive n.
人类活动，如燃料燃烧、氮肥生产、固氮植物的培育和畜牧业的集约经营等是引起全球活性氮增加的主要原因。
Actinorhizal Plants are a kind of important natural nitrogen-fixing resources, and they have high value in reforestation as pioneer and accompanying species.
放线菌根瘤植物是自然界中一类重要的固氮资源，作为先锋树种和伴生树种在造林中有重要的应用价值。
Although there is 34,500 tons of gaseous nitrogen in the air column above each acre of the earth's surface, this cannot be used by plants until it has been fixed by nitrogen-fixing bacteria and algae.
虽然在地球表面每英亩空气柱中有34,500吨气态氮，但是如果这些气态氮不被固氮菌和藻类固定，是不能被植物利用的。
Environmental factors are always one of the major reasons why the symbiotic nitrogen-fixing system of rhizobia and legumes cannot come into full play in agricultural production.
环境因子的限制一直是豆科植物-根瘤菌共生固氮体系没有在农业生产中充分发挥作用的重要原因之一。
Environmental factors are always one of the major reasons why the symbiotic nitrogen-fixing system of rhizobia and legumes cannot come into full play in agricultural production.
环境因子的限制一直是豆科植物-根瘤菌共生固氮体系没有在农业生产中充分发挥作用的重要原因之一。
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