1·Chromium treatment significantly decreased nodule Numbers, nodule fresh weight, leghemoglobin content and nitrogenase (acetylene reduction) activity per plant or per gram of nodules.
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。
2·There were many good strains which had such potential such as X4 and X1 in Xi 'an only in consideration of nitrogenase activity. But few strains with such ability were isolated from Lanzhou.
单从固氮酶活性来看，西安地区草地有开发潜力的优良菌株相对较多，如X4和X1，而兰州地区的相对较少。
3·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.
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。