研究了硝态氮与氨态氮及其不同配比对水培生菜铁素营养的影响。
The effect of N forms and NO-3-N/NH+4-N ratio on iron nutrition in hydroponically grown lettuce were investigated.
在水中，氮是以有机氮、氨态氮、亚硝酸氮和硝酸氮的形式存在的。
In water, nitrogen exists in form of organic nitrogen, ammonia nitrogen, nitrite and nitrate.
从烟叶总体质量上讲，硝态氮与氨态氮的质量比为50%：50%是可取的肥料配比。
As to the whole quality of tobacco leaf, the blend 50% : 50% of nitrate nitrogen and nitrite nitrogen is the advisable choice.
并进一步考察了上述两种底泥对水体中有机质、氨态氮和亚硝酸盐的去除能力，探寻了利用异养硝化作用改善水质环境的潜力。
From another point of view, our study tries to find a potential of heterotrophic nitrification for the improvement of contaminated aquatic environment.
我们还对传统的甲醛—硫酸法进行了改良，并将新的甲醛—硫酸法运用于硝酸尿素金属络合物中的酰氨态氮和总氮含量的测定中。
We also improved the conventional formol-H2SO4 titrimetric method, and applied it into the determinations of the contents of amide nitrogen and total nitrogen in urea nitrate metal complexes.
胶清废水系天然橡胶初加工时的一种工业废水，具有较高的生化需氧量(BOD)，其中约含有1%蛋白质，0.05 ~ 0.3%氨态氮等。
Skim serum is an industrial effluent from rubber factories. It is of higher BOD and contains about 1% protein and 0.05-0.3% ammoniacal nitrogen, etc.
天冬氨酸蛋白酶在氨态氮和游离氨基酸的形成过程中，贡献率最小；在将蛋白水解成肽氮的过程中，天冬氨酸蛋白酶和半胱氨酸蛋白酶起到了主要作用。
Aspartic peptidase made little contribution on the formation of NH3-N and AA-N. degradation of protein into peptides was attributed to aspartic-and cysteine peptidases.
这些氨的大量存在对幼苗生长产生危害，同时也很容易在转化为铵态氮和硝态氮之前挥发损失。
These large pools of ammonia are detrimental to seedling growth and are very susceptible to gaseous loss by volatilization before chemical conversion back to the ammonium and nitrate forms.
在优化条件下，系统最终氨氮去除率能达到85%以上，亚硝态氮去除率达到95%以上，系统运行效果良好，且具有重现性。
Under optimum conditions, the removal efficiencies of ammonia and nitrite nitrogen could be above 85% and 95%, the system is running well and has reproducibility.
青萍对氨氮的吸收利用能力高于对硝态氮的吸收利用能力。
The absorption capability to ammonia of duckweed is stronger than to nitrate.
结果表明：利用曝气时间实时控制，在每个周期内氨氧化菌（AOB）降解氨氮质量大于亚硝酸盐氧化菌（NOB）降解亚硝态氮质量；AOB的净增数量大于NOB净增数目。
Analysis shows that more nitrogen is oxidized by ammonia oxidizing bacteria(AOB) than by nitrite oxidizing bacteria(NOB) with more growth of the AOB than the NOB in each cycle when using this method.
结果表明：利用曝气时间实时控制，在每个周期内氨氧化菌（AOB）降解氨氮质量大于亚硝酸盐氧化菌（NOB）降解亚硝态氮质量； AOB的净增数量大于NOB净增数目。
Analysis shows that more nitrogen is oxidized by ammonia oxidizing bacteria(AOB) than by nitrite oxidizing bacteria(NOB) with more growth of the AOB than the NOB in each cycle when using this method.
可见，氮添加和水氮添加均促进了土壤的氨挥发，对硝态氮的淋溶没有显著影响。
The results suggested that both nitrogen addition and water and nitrogen addition promoted the ammonia volatilization, but had little effects on the nitrate leaching of the sandy grassland.
可见，氮添加和水氮添加均促进了土壤的氨挥发，对硝态氮的淋溶没有显著影响。
The results suggested that both nitrogen addition and water and nitrogen addition promoted the ammonia volatilization, but had little effects on the nitrate leaching of the sandy grassland.
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