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1)  critical nitrate N concentration(CNC)
硝态氮临界含量
2)  nitrate nitrogen concentration
硝态氮含量
1.
In order to study the water quality and response to influencing factors in typical watersheds of Three Gorges area between 2004 and 2005,the variation characteristics of nitrate nitrogen concentration were analyzed under heterogeneous landscape condition through continuous observation with method of dividing into sub-watersheds in Quxi watershed(the first-grade branch,located in Three Gorges).
为了解三峡地区典型农业流域水体水质状况以及对流域各影响因素的响应,在2004年和2005年间,对三峡库区内长江一级支流曲溪的水体硝态氮含量进行了连续监测,利用划分子流域的方法,分析了该流域异质景观条件下溪流水硝态氮含量的变化特征。
3)  soil NO-3-N content
土壤硝态氮含量
1.
The effects of irrigation amount on grain quality,yield and soil NO-3-N content were studied with strong gluten wheat "Jimai 20" and middle gluten wheat "Taishan 23" by setting four irrigation amount treatments(with 0 mm,180 mm,240 mm,300 mm irrigation amount respectively) under field condition.
选用强筋小麦济麦20和中筋小麦泰山23两个品种,在大田条件下设置不灌水(0 mm)、灌水180 mm,240mm和300 mm 4个处理,研究了灌水量对籽粒品质和产量及土壤硝态氮含量的影响。
4)  critical content
临界含量
1.
This paper summarizes recent research results on soil element background values and heavy metal environmental capacity in the region, and discusses the differentiation pattern of the environmental background value and critical content of the main zonal soils in Guangdong.
综合了近年国内在该区域所开展的有关土壤中元素背景值和重金属环境容量的研究成果,对广东主要的地带性土壤的环境背景值和临界含量的分异规律做了一些探
2.
By pot culture experiment, the effects of lead added to latosol with different concentrations on peanut crop growth and remains were studied, and the referential critical content of lead in peanut crop was fut forward from the aspects of hygienic quality of agricultural product and effect of crop.
利用盆栽试验,研究在砖红壤上添加不同浓度的铅对花生作物的生长和残留的影响,从农产品卫生质量和作物效应两方面出发,提出花生作物的铅参考临界含量。
5)  critical content of oxygen
临界氧含量
1.
Firstly,this paper experimentally made a study of the explosion limit rules of flammable gas(CH4)and its change rule of critical content of oxygen after inert gas(N2)was added into it,and measured the explosion limit range of methane and its safety content of oxygen.
通过实验,研究可燃气体(甲烷)的爆炸极限规律和加入惰性气体(氮气)后可燃气体临界氧含量的变化规律,测定在特定条件下甲烷的爆炸极限范围和安全氧含量,根据实验结果,确定氧含量的安全标准并提出相应的事故预防与控制措施,确保注空气采油技术实施过程中的风险处于可控制范围内,使注空气采油技术得到更广泛的应用。
6)  critical contents
临界含量值
1.
Dynamics of absorption and accumulation of Lentinula edodes accumulated heavy metals from culture medium and critical contents;
香菇对培养基中有害重金属的吸收富集规律及临界含量值
补充资料:硝态氮
分子式:
CAS号:

性质:以硝酸根离子NO3—形态存在于土壤、植物和肥料中的氮素。常用符号NO3——N表示。硝酸钠、硝酸钙、硝酸铵(除含硝态氮外,还含有铵态氮,因其性质更接近硝态氮肥,故归入之)都属于硝态氮肥。淹水的水稻田中硝态氮含量很少,而在温带旱作土壤中硝态氮常有积累。它是植物直接吸收利用的速效性氮素。土壤中硝态氮含量随季节和植物的不同生育期而变。土壤硝态氮不被土壤吸附,雨季易淋失,水田中还可因反硝化作用而损失。植物中的硝态氮是植物体内主要的无机态氮,在一定范围内植物中的硝态氮含量可反映当时土壤供氮状况和植物体内氮素营养水平。但水稻体内所含硝态氮极少,不能作为氮素营养水平和诊断指标。植物组织液中硝态氮的含量(以N计)约为100~1000mg/kg。硝态氮是水质监测的重要项目之一。有些国家已将含氮订入了湖沼水质的标准。

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