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.
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.
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.
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.
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.
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.
轮作可以降低土壤ec值、盐分和硝态氮含量。
轮作可以降低土壤ec值、盐分和硝态氮含量。
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