The results indicate the maximal relative error between simulation values and observation values of total nitrogen concentration is 11.67%.
结果表明，地下水总氮含量模拟值与实测值最大相对误差11.67%。
The COD, ammonia and total nitrogen (TN) removal efficiency were studied in the paper at low DO concentration in a pilot-scale A/O nitrogen removal plant treating domestic wastewater.
应用A/O中试装置处理实际生活污水，研究了低DO浓度下系统对有机物、氨氮和总氮的去除效果。
The effect of nitrogen on growth, total alkaloids concentration and total alkaloids yield of Sophora flavescens was studied.
结果表明，施用氮肥对苦参生长以及苦参总碱含量均有显著促进效应。
In the determination of total nitrogen in water sample by flow injection analysis instrument, the concentration of sulfuric acid which used for the preservation of sample affected the result.
用流动注射仪测定总氮水样，发现用不同的硫酸浓度保存总氮样品时，对其测定结果有一定的影响，并与过硫酸钾氧化-紫外分光光度法进行比对和分析。
Nitrogen concentration in mature leaves(N_g)and nitrogen concentration in senescing leaves(N_s)increased with increasing soil(organic) matter, total soil nitrogen and soil moisture.
植物叶片N素含量与土壤有机质、土壤N素含量和土壤含水量呈显著正相关；
Nitrogen concentration in mature leaves(N_g)and nitrogen concentration in senescing leaves(N_s)increased with increasing soil(organic) matter, total soil nitrogen and soil moisture.
植物叶片N素含量与土壤有机质、土壤N素含量和土壤含水量呈显著正相关；
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