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田间自然条件下，利用15N稀释标记技术评价19价大豆种质的固氮能力。结果表明，固氮量和固氮比率的变幅分别为N67～140kg／hm2和35％～60％。筛选出3份固氮量超过N130kg／hm2和固氮率大于55％的高固氮种质材料。15N标记可真实地反映出品种的实际固氮水平。
Field natural conditions, the use of 15N dilution marker technology to evaluate 19 nitrogen-fixing soybean germplasm capacity. The results showed that the amplitude of nitrogen fixation and nitrogen fixation were N67 ~ 140kg / hm2 and 35% ~ 60% respectively. Three high-nitrogen-fixing germplasm materials with more than N130kg / hm2 nitrogen fixation rate and more than 55% nitrogen fixation rate were screened. The 15N mark truly reflects the actual nitrogen fixation level of the breed.