查询词典 nitrogen

Using soil culture and micro-field experiment, we study the effects of controlled release nitrogen fertilizer on growth, physical index, output and fertilizer utilization ratio of the lettuce by comparing the controlled release nitrogen fertilizer with commercial quick-acting N fertilizers at different available N level.

采用盆栽和田间试验，探讨了控释氮肥脲甲醛不同供氮水平条件下的肥料效应；并采用微区试验比较了控释氮肥与其他速效氮肥品种对莴苣生长，形态指标，产量及利用率的影响。

In the actual production, the amount of nitrogen can neither too high nor too low, further more, different types of species, require different volume of nitrogen and planting density.

实际生产中，施氮量既不能过高，也不能过低，而且不同类型的品种，对施氮量和栽插密度的要求有所不同。

Statistic analysis showed that soil temperature as the driving factor to the diurnal variation of soil respiration. Soil temperature and soil moisture were the dominant environmental factors affecting the seasonal variation of soil respiration and explained 87% of its variability. LAI and root biomass were positively related to soil respiration rate, indicating that biotic factors also affected the seasonal variation of soil respiration. However, soil properties such as soil organic content, total nitrogen content, and C/N ratio had poor correlations with soil respiration. Top-dressing nitrogen fertilizer increased soil respiration significantly.

统计分析表明：土壤温度是玉米生态系统土壤呼吸日变化的驱动因素；土壤温度和土壤水分是影响土壤呼吸季节变化的关键因素，二者可以解释玉米生长季土壤呼吸时间变异的87%；LAI和根系生物量与土壤呼吸速率呈正相关，说明生物因子对土壤呼吸季节变化也有影响；土壤有机质、全氮和碳氮比等土壤理化特性与土壤呼吸速率的关系较弱；玉米生长季追施氮肥明显促进土壤呼吸速率。

In this paper,soil pH,the content of organic matter,total nitrogen,potassium and phosphorus,available nitrogen,potassium and phosphorus,water-soluble chlorine of the main soil types was studied in the Yunnan Tobacco-growing areas.

中文摘要：本文系统地研究了云南省植烟区的主要土壤类型的pH值和有机质、全氮、速效氮、全钾、速效钾、全磷、速效磷、水溶性氯含量等理化指标，明确了不同土壤的养分丰缺状况，依据测土配方施肥的要求，制定了合理的施肥对策。

By remaking now available glow ion nitrogen furnace and technological test , the range of ion nitrogen is enlarged, the questions of oxide and being out of shape are solved.

通过改造现有辉光离子氮化炉及工艺试验，扩大离子氮化的氮化范围，解决离子氮化后的氧化及变形问题。

When the zeolite surface with strain ed siloxane linkages or with positive and negative charges is exposed to nitrogen at high temperature, partially dissociative adsorption of nitrogen is expected to take place.

当这种带有有张力的硅氧烷鍵或带有正负电荷的沸石表面与氮气在高温下相接触时，氮气就可能发生部分的解吸附。

The roots of spring-sown maize and summer-sown maize could touch with each other in relay-planting system, which made the roots competed for water and nutrition. Thus, more of the water and nitrogen in those soil layers were used, which led to the decrease of water and nitrogen in those soil layers.

玉米根系数量和TTC还原总量在剖面分布上均发生交叉，春、夏玉米间存在养分与水分的竞争，使根系所达到的区域土壤养分和水分利用量增加，从而使相应土层土壤全氮含量和水分含量下降。

In this paper, the construction of simple nitrogen laser is herebyintroduced; The relationship between distance of spark gap and discharge voltage, outputenergy of the nitrogen laser and discharge voltage, have been studied experimentally.

介绍了一种简易氮分子激光器的构造；实验研究了火花隙距离与放电电压的关系和激光器输出能量与放电电压的关系。

The space variation characteristic of different layer soil organic matter and total nitrogen is different, but the structure factor plays a leading role in the space variation of full nitrogen and organic matter.

不同层次土壤有机质与全氮的空间变异特征具有一定的差异，但结构性因素对有机质与全氮的空间变异起主导作用。

A 3-year-long field experiment was carried out to investigate the effects of nitrogen rate on nitrogen uptake and utilization of winter wheat and residual nitrate in soil under straw mulch.

通过田间定位试验研究秸秆覆盖条件下施氮量对小麦氮素吸收利用及土壤硝态氮残留的影响。

I want to be a big fish in a small pond.

我要做一条在小池塘里的大鱼。

While the software functioned well, we did not feel the same about their customer support!

虽然该软件运行良好，我们没有同样的感觉他们的客户支持！