经固氮酶活性测定，PA19、PA2和PK1菌株具有较强的固氮酶活性。

The results showed that PA19, PA2 and PK1 strains had high nitrogenase activities.

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铬还使单株固氮酶活性(乙炔还原法测定)显著降低，用高浓度铬处理者克瘤固氮活性也显著降低。

Chromium treatment significantly decreased nodule Numbers, nodule fresh weight, leghemoglobin content and nitrogenase (acetylene reduction) activity per plant or per gram of nodules.

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低浓度硝酸盐在生育前期对吉林20号根瘤固氮酶活性有促进作用，酰脲含量增加，在生育后期有抑制作用。

If low nitrate concentration was applied to Jilin 20, its nodule nitrogenase activity and ureide content were increased in early growth period, but were inhibited in later growth period.

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