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.
用亚硝酸钠和脲素除去外来的氧化剂后，以碘量法测定，全部操作可在几分钟内完成。
The samples are dissolved in aqueous solution of sulphuric acid or alkalis which can be heated if necessary, and the solution thus formed is treated rapidly with large excess of oxidant.
用亚硝酸钠和脲素除去外来的氧化剂后，以碘量法测定，全部操作可在几分钟内完成。
The samples are dissolved in aqueous solution of sulphuric acid or alkalis which can be heated if necessary, and the solution thus formed is treated rapidly with large excess of oxidant.
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