查询词典 nitrogen-free

In a word, the effect of azotobacter fertilizer on living activity, soil fertility and crop quantity is Significant within the scope of 0.05-0.20g/kg of using nitrogen in the soil, and the effect is most prominent at the level of 0.15g/kg of using nitrogen.

由此可见，固氮菌肥料对于土壤的生物活性、土壤肥力和作物品质的促进作用在土壤施氮量为0.05～0.20g/kg范围内均表现出明显效果，但以0.15g/kg效果最为突出。

A method for determination of basic nitrogen-containing compounds in mainstream smoke was established. In the condition of basic substance barium hydroxide powder and extractant chloroform, 18 basic nitrogen-containing compounds were analyzed by gas chromatography-selective ion monitored-mass spectrometry, such as pyridine, 2-methylpyridine, 2-methylpyrazine, quinoline and indole, etc.

在氢氧化钡碱性环境中，以三氯甲烷为萃取剂，采用气相色谱－选择离子监测－质谱法测定吡啶、2-甲基吡啶、2-甲基吡嗪、喹啉、吲哚等18种碱性含氮化合物。

S a main source and sink of nitrogen from lake wetland ecosystem, lake sediment has an important significance for biogeochemical cycle of nitrogen.

bstract 湖泊底泥作为湖泊湿地生态系统中氮素的主要源与汇，对氮素的生物地球化学循环具有重要意义。

The relation between soil acidification and nitrogen cycle disturbed by man made factors was studied from the viewpoint of biogeochemical cycle, and the mechanism of soil acidification induced by disturbed nitrogen cycle was probed.

从生物地球化学循环的观点出发，研究了 N 循环的人为干扰与土壤酸化的关系，并探讨了 N 循环扰动下导致土壤酸化的机理。

Soil total nitrogen content and soil available nitrogen content of farmland in Shuangcheng city were analyzed in the research based on 80s' soil nutriments data of the Scientific Database of Agroecology and Blackland in Northeast and 500 soil samples that were collected from the field in 0-20cm in 2005. The maps of soil TN and AN (1:50000) in the 80s were digitized and overlaid with the correspondent maps of 2005 using ArcMap.

本研究利用科学数据库多年来积累的历史图件和数据，并结合2005年耕层（0-20cm）500个采样数据为基础，选择典型黑土区双城市农田为研究区域，分析了22年来该县耕地土壤全氮和碱解氮的时空变化。

Both in green house and in the open field ,relative content and total content of characteristic aroma components:of butanoic acid, methyl ester; butanoic acid, ethyl ester; hexanoic acid, methyl ester; hexanoic acid, ethyl ester; DMHF; DMMF trended to increase and then decline with the increment of nitrogen fertilizer, and the highest was the Mid-N fertilizer treatment. So favorable nitrogen application can promote the process of fruit aroma, that is , feasible fertilizer application could enhance fruit flavor.

在温室和露地两种栽培条件下，除成熟草莓果实的特征香气成分丁酸甲酯、丁酸乙酯、己酸甲酯、己酸乙酯、DMHF、DMMF的相对含量和总量均是随施氮量增加先增加后减少，中量氮肥处理最高，合理的施氮量有利于果实香气的形成，即适宜的施肥量有利于增进果实风味。3。

Camphorate, in which the corn powder was best, while the yam powder and lactic acid were comparatively poorer. The utilization of nitrogen sources by A. camphorate was diverse. The organic nitrogen sources were better than inorganic ones. The best result was achieved when (NH4)2SO4 and wheat bran was co-added, but (NH4)2CO3 could be hardly used when added solely.

樟芝对碳源利用较广，其中以玉米粉效果最好，而对山芋粉和乳糖的利用较差；樟芝对氮源的利用具有差异性，其中对有机氮源的利用较无机氮源好，以硫酸铵＋麸皮复合培养效果最佳，而对碳酸铵几乎不利用。

In this paper, in order to better understand the molecular nitrogen and other gases in the discharge of space plasma discharge process mechanism, on the establishment of a nitrogen capacitive coupling of the RF glow discharge particle simulation combined with Monte Carlo and from the simulation of the N2 RF discharge electricity in the space distribution of the electric field and charged particles (e, N2 +, N +) acts.

本文为了更好的理解氮气以及其他分子气体放电在放电空间的等离子体过程机理，建立了一个关于N2电容耦合射频辉光放电的粒子模拟与蒙特卡罗相结合的自恰模拟，模拟了N2射频放电在放电空间的电场分布和带电粒子（e， N2+，N+）行为。

With morphology characteristics of erosion concave of Ag and Pd contact materials in nitrogen and air being compared, influence on erosion, welding and breakdown voltage of contact for nitrogen and SF_6 being analyzed, influence on contact for the formic acid, toluene, carbinol and distilled water being analyzed, it was showed that the influence on performance parameters of relay contact for various atmospheres is very com...

通过比较触头材料Ag和Pd分别在氮气和空气中侵蚀凹坑的形状特征，分析了氮气和SF6等气氛对触头侵蚀、熔焊、耐压的影响，及甲酸、甲苯、甲醇、蒸馏水等对触头的影响，表明各种气氛对继电器触头性能参数的影响十分复杂，该影响涉及对电弧运动规律的影响和与材料的化学反应。

Yet carotenoid and nitrate nitrogen in leaf sheath showed no obvious relationship with nitrogen uptake and utilization.

阐明了氮素利用效率不同的三类水稻品种的C、N代谢差异及其与氮素调控的关系。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。