nitrate nitrogen

The results of experiments indicate that different blend of nitrate nitrogen and nitrite nitrogen in the fertilizer can decrease the nitrate content and nitrite content, then get the goal of decreasing TSNA in the flue-cured tobacco through the technique of fertilization in the field.

本试验结果表明，不同硝态氮与氨态氮肥料配比可以降低烟叶内硝酸盐和亚硝酸盐的含量，从而可以通过大田施肥技术来达到降低烟草特有亚硝胺的目的。

With the nitrogen application, the nitrate nitrogen contents in spinach leaves were only dramatically decreased by Mo application at growth prophase, the ( decreasing) amplitude was 21.2%.

施氮条件下，施钼仅显著降低了菠菜生长前期叶片中硝态氮含量，降幅达212%。

Soil nitrate nitrogen sensing for tea garden based on diffuse reflectance spectroscopy

基于漫反射光谱的茶园土壤硝态氮检测

The fertilizer product contains nitrate nitrogen and urea nitrogen and thus has high fertilizer effect.

该方法生产的产品中同时含有硝态氮,尿态氮,因此肥效显著.

The results showed that enhanced ammonia nutrition ( EAN) promoted the absorption of ammonium nitrogen and restrained the absorption of nitrate nitrogen.

结果显示，增铵营养促进了棉株对氨基态氮的吸收而抑制硝态氮的吸收；

Simultaneously Determination of Fluoride, Chloride, Bromide, Nitrate Nitrogen And Sulfate in Water by Ion Chromatography

光离子检测器测定大气中溴甲烷离子色谱法同时测定水样氟、氯、溴、硝酸盐氮和硫酸根

In many plants, including most tree crops, nitrate nitrogen does not usually occur in the leaves.

在一些植物中, 包括绝大多数的木本作物, 硝态氮并非经常存在于叶片中.

The Matlab/ Simulink simulation showed that the controller had good dynamic qualities and strong resistance to bleat loading, could respond quickly to influent loading could reduce the effluent nitrate nitrogen and total nitrogen concentration, and meanwhile lowered greatly external carbon addition amount.

由Matlab/Simulink模拟表明，该控制器具有良好的动态品质、抗冲击负荷强，可快速响应进水负荷的变化，能在降低出水硝酸氮和总氮浓度的同时，大大降低外碳源投量。

Everybody concerned how to decrease the nitrate nitrogen content in vegetable increasingly.

如何降低蔬菜中的硝态氮含量受到人们日益广泛的关注.

The results showed that the affinity of the roots of lettuce seedlings to ammonium nitrogen ( NH 4+ N) was slightly higher than that to nitrate nitrogen ( NO 3-N).

结果表明，莴笋幼苗根系对NH4+N的亲和力稍大于NO3-N的亲和力；

The content of nitrate nitrogen demonstrates a significantly decreasing tendency with the increase in freezing and thawing tensity and frequency.

随着冻融强度的加大和冻融频次的增加，土壤中的硝态氮的含量呈现出显著下降的趋势。

Compare with farmer conventional fertilization optimized fertilization and optimized fertilization combined with ameliorant treatments can reduce the contents of nitrate nitrogen, available nitrogen and available P, optimized fertilization combined with Potassium humate is best.

与农民习惯施肥相比，优化施肥及优化施肥结合改良剂处理可以显著降低土壤硝态氮、碱解氮、速效磷含量，以优化施肥+腐植酸钾处理效果最好。

Nitrate nitrogen removal from ground water by autotrophic denitrification in a packed bed reactor;

结果表明，该反应器通过硫自养反硝化作用能有效去除水体中硝酸盐氮。

A direct method of determining nitrate nitrogen in ground water and drinking water has been studied.

文章探讨了一种测定地表水和饮用水中硝酸盐氮的直接方法——离子色谱法.

Effect of Chemical Fertilizers to Content of Vitamin C and Nitrate Nitrogen on Cabbage

化肥对大白菜维生素C及硝态氮含量的影响

The content of soil nitrate nitrogen was the least in the treatment of 30 cm subirrigation pipe depth with prevention film.

在不同渗灌管埋深处理中以30cm埋深且渗灌管下有防渗槽的处理，其硝态氮在表层积累最少。

The indexes for the test were mainly chroma, turbidity, PH, the total hardness, Fe, Mn, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, sulfate, fluoride, colony forming unit ( cfu), total coliform, and fecal coliform.

检验指标包括色度、浑浊度、pH值、总硬度、铁、锰、氨氮、亚硝酸氮、硝酸盐氮、硫酸盐、氟化物、细菌菌落总数、总大肠菌群和粪大肠菌群。

Study on Nitrate Nitrogen Removal in Chemical Denitrification by Supported Nano Zero-valent Iron

负载型纳米铁化学反硝化法去除硝酸盐氮的研究