factors affecting content of nitrate-nitrogen in soil
影响土壤硝态氮含量的因素
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
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。
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