施用氮肥可明显增加土壤硝态氮残留数量，并影响其剖面分布；
Application of N fertilizer significantly increased the amount of residual nitrate-N, and affected its distribution in the soil profile.
土壤硝态氮的淋失不但造成肥料的损失，而且产生严重的环境问题。
Soil nitrate leaching not only causes the loss of fertilizer, but also brings about serious environmental problems.
一定水氮供应条件下，露地生产蔬菜地土壤硝态氮有可能淋洗到1.8米土体以下。
Under a certain water and nitrate treatments, soil nitrate in open-land vegetable field would move down below 180cm soil.
采用二次回归正交旋转组合设计，研究了水肥耦合效应对保护地土壤硝态氮运移的影响。
Coupling effects of water and fertilizers on translocation of nitrate nitrogen in protected land were studied with the design of quadratic orthogonal rotational combinations.
目前中国存在着施肥不合理的现象，亟须简易可靠的田间测土技术，因此，田间土壤硝态氮快速测定方法在中国将有着广阔的应用前景。
The quick on-farm test method is economical, simple and easy for farmers, so it has a largely potential application in China to eliminate the irrational fertilization at present.
实验研究了双氰胺在玉米苗期对土壤微生物细菌、霉菌和放线菌的影响，及对土壤中铵态氮和硝态氮贮量变化的影响。
This paper reports the effect of DCD in seedling stage to soil microorganism of bacteria, mold and actinomycetes, and the concentration changes of both ammonium nitrogen and nitrate nitrogen in soil.
土壤容重和有机质含量对硝态氮的垂直运移有很大的影响；
The vertical transport of nitrate-N was also affected by the soil bulk density and the organic matter content.
采用田间试验及人工渗滤池试验方法，研究了土壤中硝态氮含量的影响因素。
An experiment in field and artificial penetration-filter pond test both were conducted to show factors affecting content of nitrate-nitrogen in soil in the present study.
继续增加施氮量，土壤微生物量氮含量增加，但土壤中残留大量硝态氮，易淋溶损失。
Applying more nitrogen would increase the content of soil microbial biomass nitrogen, but might result in large amount of nitrate residue in soil and suspected to leaching loss.
结果表明，对于同一封育年限的油松林地，土壤有机质、硝态氮、速效磷和脲酶含量随采样深度增加而减小；
The results show that in the same H & A, with depth of soil increasing, contents of organic matter(OM), NO-3-N, available phosphor(AP) and urease decreased respectively.
土壤中硝态氮和铵态氮的含量直接影响着作物的生长和品质。通过田间试验研究了不同有机肥料氮素在土壤中的转化及其对草莓生长和果实品质的影响。
A field experiment was conducted to investigate the nitrogen transform of different organic manures in soil, and its effects on the growth and quality of strawberry.
溪流相邻高地通过地下径流向溪流中N素的输入，主要是以硝态氮的形态通过土壤水的输入；
N in the main form of nitrate through the subsurface runoff was put into the stream, the vegetation-covered riparian had high on the nutrient in the soil water.
赤红壤中添加DCD在同一培养时间均能显著降低土壤较高的铵态氮含量，提高硝态氮含量。
The results indicated that adding DCD significantly increased ammonium content and decreased nitrate nitrogen content at the same time.
灌水量相同时，土壤中硝态氮增加量和地下水中硝态氮的增量与地下水埋深成多项式关系。
With the same irrigation amount, the increasing of nitrate nitrogen content both in the soil and groundwater has the polynomial correlation with groundwater table.
生物试验表明：两种肥料有利于草坪质量的提高，减少土壤中硝态氮的淋失，提高肥料的利用率。
Biological tests show that both fertilizers are helpful to improve lawn quality, reduce nitrate nitrogen leaching loss and raise fertilizers utilization rate.
如何解决土壤深层硝态氮高累积的问题备受人们专注。
Some people has focus on the issue that how to solve the high accumulative nitrate of subsoil.
可见，氮添加和水氮添加均促进了土壤的氨挥发，对硝态氮的淋溶没有显著影响。
The results suggested that both nitrogen addition and water and nitrogen addition promoted the ammonia volatilization, but had little effects on the nitrate leaching of the sandy grassland.
轮作可以降低土壤ec值、盐分和硝态氮含量。
结果表明：随着氮肥用量的提高，土壤剖面硝态氮累积量明显增加，其向土壤下层淋溶的程度也越严重；
The results show the amounts of NO3-N accumulation in the soil profiles and their extents to leach into the deeper soil layers are increased significantly as the nitrogen fertilizer usage increased.
结果表明：随着氮肥用量的提高，土壤剖面硝态氮累积量明显增加，其向土壤下层淋溶的程度也越严重；
The results show the amounts of NO3-N accumulation in the soil profiles and their extents to leach into the deeper soil layers are increased significantly as the nitrogen fertilizer usage increased.
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