在水中，氮是以有机氮、氨态氮、亚硝酸氮和硝酸氮的形式存在的。
In water, nitrogen exists in form of organic nitrogen, ammonia nitrogen, nitrite and nitrate.
硝态氮和水溶性有机氮随灌溉水向下迁移，对底土具有培肥作用。
Nitrate and water soluble organic nitrogen were migrated with deionised water migrating and increased subsoil fertility.
在连续观测中，各形态溶解有机氮、磷的变动趋势与无机态较为接近。
In the continual observation, size-fractionated dissolved organic N and P had similar trend with their inorganic counterparts.
对轮作及大豆、玉米、小麦长期连作白浆土中氮含量及有机态氮组分变化进行研究。
The nitrogen contents and nitrogen forms were studied in albic soil with longterm crop rotation and soybean, maize, wheat continuous cropping.
未经消化的二级生活污水处理厂脱水污泥含氮4.12%，其中有机态氮占93%。
Undigested dewatered domestic sewage sludge from secondary treatment plant contained N 4.12%, of which organic form of N accounted for 93%.
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.
且土壤有机质、全氮、酸水解性总氮、氨基酸态氮和碱解氮含量按照石漠化程度的由轻度到极强度而呈递减趋势，但土壤其他氮素含量并未表现相同的变异规律。
Compared with Karst no-Rocky Desertification soil, the content of soil Organic Matter and Nitrogen in various degrees of Karst Rocky Desertification shows a tendency to drop suddenly.
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.
不施用有机肥时，水溶性无机态氮为水溶态氮素流失的主要形态，所占比例在60％左右；
Without the application of manure, the inorganic nitrogen is the main pattern of the water-solution nitrogen loss, occupying about 60%.
并进一步考察了上述两种底泥对水体中有机质、氨态氮和亚硝酸盐的去除能力，探寻了利用异养硝化作用改善水质环境的潜力。
From another point of view, our study tries to find a potential of heterotrophic nitrification for the improvement of contaminated aquatic environment.
施用有机肥后，水溶性有机态氮是水溶性氮素流失的主要形态，平均占到60- 70%以上。
With the application of the organic manure, the organic nitrogen is the main pattern of the water-solution nitrogen loss, of which the average occupies more than 60-70%.
施用不同的有机肥，对降低烤酒中部叶片硝态氮含量有一定作用，但上部叶的硝态氮含量有所提高。
Nitrate and nitrite contents could be decreased for middle but increased for uppers in flue cured tobacco leaves by applying different organic manures.
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.
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.
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